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* NighInvulnerability: On par with Yellow Diamond. [[spoiler:She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced. In "Change Your Mind" she resisted several seconds of sustained assault from Yellow Diamond's electrical attack, which instantly poofs other Gems after a quick blast and stood up not long after.]]
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* NighInvulnerability: On par with Yellow Diamond. [[spoiler:She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced. In "Change Your Mind" she resisted several seconds of sustained assault from Yellow Diamond's electrical attack, attack and stood up not long after. The same electrical attack which instantly poofs other Gems after a quick blast and stood up not long after.blast.]]
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Changed line(s) 169 (click to see context) from:
* NighInvulnerability: On par with Yellow Diamond. [[spoiler:She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced.]]
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* NighInvulnerability: On par with Yellow Diamond. [[spoiler:She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced. In "Change Your Mind" she resisted several seconds of sustained assault from Yellow Diamond's electrical attack, which instantly poofs other Gems after a quick blast and stood up not long after.]]
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* MyGodWhatHaveIDone: [[spoiler:Steven questions how many times she'd hurt Pink and made her cry, Blue replies she never did...then it slowly dawns on her how many times she actually did, and she's essentially trapped herself in a cycle of hurting Pink. And is doing so again that very moment. This realization finally cements her HeelRealization, making her realization ''exactly'' why Pink decided to abandon Homeworld to live on Earth.]]
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* LargeAndInCharge: She's only slightly shorter than Yellow, as seen when the two stand side by side in the fourth and fifth seasons. The height difference is probably because Yellow wears heels.
* LaserGuidedKarma: [[spoiler:She gets hit by this ''hard''. Since she was such a BadBoss towards her subjects and was so [[AloofBigSister condescending]] to Pink, the latter ends up [[FakingTheDead faking her death]], which makes her cross the DespairEventHorizon and mourn Pink's "death" for ''millennia''.]]
* LeanAndMean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is {{subverted|Trope}} as she is more traditionally feminine-looking than her 'sister' Yellow Diamond with a fuller, more hourglass shape. Whether this is due to Garnet being an UnreliableNarrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known.
* LaserGuidedKarma: [[spoiler:She gets hit by this ''hard''. Since she was such a BadBoss towards her subjects and was so [[AloofBigSister condescending]] to Pink, the latter ends up [[FakingTheDead faking her death]], which makes her cross the DespairEventHorizon and mourn Pink's "death" for ''millennia''.]]
* LeanAndMean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is {{subverted|Trope}} as she is more traditionally feminine-looking than her 'sister' Yellow Diamond with a fuller, more hourglass shape. Whether this is due to Garnet being an UnreliableNarrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known.
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* LargeAndInCharge: She's only slightly shorter than Yellow, as seen when the two stand side by side in the fourth and fifth seasons. The height difference is probably because Yellow wears heels.
heeled boots.
* LaserGuidedKarma: [[spoiler:She gets hit by this ''hard''. Since she was such a BadBoss towards her subjects and was so [[AloofBigSister condescending]] to Pink, the latter ends up [[FakingTheDead faking her death]], which makes her cross the DespairEventHorizon and mourn Pink's "death" for ''millennia''.]]
It only takes Steven [[CallingTheOldManOut convincing her that her behavior was wrong]] for her to ''finally'' realize the flaws of Homeworld and the Diamonds - the kicker is since Pink Diamond is truly dead, she could never apologize to her little 'sister' for what she had done]].
* LeanAndMean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is {{subverted|Trope}} as she is more traditionally feminine-looking than her 'sister' Yellow Diamond with a fuller, more hourglass shape. Whether this is due to Garnet being an UnreliableNarrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known. [[spoiler:After experiencing a HeelRealization, she decides to [[HeelFaceTurn avert it]] and help Steven and Connie get to White Diamond]].
* LaserGuidedKarma: [[spoiler:She gets hit by this ''hard''. Since she was such a BadBoss towards her subjects and was so [[AloofBigSister condescending]] to Pink, the latter ends up [[FakingTheDead faking her death]], which makes her cross the DespairEventHorizon and mourn Pink's "death" for ''millennia''.
* LeanAndMean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is {{subverted|Trope}} as she is more traditionally feminine-looking than her 'sister' Yellow Diamond with a fuller, more hourglass shape. Whether this is due to Garnet being an UnreliableNarrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known. [[spoiler:After experiencing a HeelRealization, she decides to [[HeelFaceTurn avert it]] and help Steven and Connie get to White Diamond]].
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* MessyHair: [[spoiler:In "Change Your Mind", after Steven gets through with her about her behavior towards Pink, Blue's perfectly groomed hair starts becoming more unkempt as she finally realizes the scope of her actions. It shows how her 'Diamond' persona is breaking, allowing her to truly gain human empathy]].
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** [[spoiler:She let's out during her confrontation with Yellow that she's realized the Gems under them have been suffering and seems to understand how immoral it is, but was burying it to live up to White's standards. This makes her sparing the Earth Quartz Gems, treating her Pearl well, and being furious at the trial when Yellow needlessly poofed the Zircons take on a completely different meaning.]]
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[[spoiler:She treats her Pearl well, spared the Earth Quartz Gems, and is enraged when Yellow needlessly poofs the Zircons. As it turns out and she admits to Yellow, she's realized their Gems are suffering needlessly and ''does'' feel bad about it, but is too afraid of disappointing and enraging White to ''act'' on it.]]
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A lot of the SU pages are locked so I'm editing the ones that are still open.
* DidYouJustPunchOutCthulhu: [[spoiler: In "Change Your Mind", she slaps Yellow on the wrist, leading to an all-out fight between them]].
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* DotingParent: In a flashback on the Moon base in "Can't Go Back", she speaks to Pink Diamond about the latter's first colony in a stern, yet kind way. [[spoiler:That said, Pink Diamond didn't see her that way and believed she and the others never cared at all about her.]] After she learns that [[spoiler:Steven is Pink Diamond reincarnated, the first thing she's shown doing in "Reunited" is crying tears of joy while nuzzling Steven. Later on, Blue is quick to support his decision to try to uncorrupt Centipeetle and is willing to go to Homeworld to talk to White Diamond despite her fear of White.]]
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* DotingParent: In a flashback on the Moon base in "Can't Go Back", she speaks to Pink Diamond about the latter's first colony in a stern, yet kind way. [[spoiler:That said, Pink Diamond didn't see her that way and believed she and the others never cared at all about her.]] After she learns that [[spoiler:Steven is Pink Diamond reincarnated, the first thing she's shown doing in "Reunited" is crying tears of joy while nuzzling Steven. Later on, Blue is quick to support his decision to try to uncorrupt Centipeetle and is willing to go to Homeworld to talk to White Diamond despite her fear of White.]] In "Change Your Mind", Yellow calls her out for constantly bending the rules for Pink]].
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** [[spoiler:Following from the above point, with "Pink Diamond"'s reveal and return, Blue has gotten her closure and is eager to return to life as it was before the Crystal Gem rebellion, believing the Diamonds would become a loving family again... but "Pink" and "her" unorthodox ways continues to frustrate her, and by "Battle of Heart and Mind" when "Pink" makes it clear that "she"'s refusing to follow "her" family's expectations, Blue ''snaps'' to the point of ''physically attacking her''. From Blue's perspective, it's a heartbreaking parallel to a parent's child refusing to acknowledge or appreciate the love and support their given, or having their way of thinking clash with that of the parent's]].
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** [[spoiler:Following from the above point, with "Pink Diamond"'s reveal and return, Blue has gotten her closure and is eager to return to life as it was before the Crystal Gem rebellion, believing the Diamonds would become a loving family again... but "Pink" and "her" unorthodox ways continues to frustrate her, and by "Battle of Heart and Mind" her. By "Change Your Mind", when "Pink" makes it clear that "she"'s refusing to follow "her" family's expectations, Blue ''snaps'' laments that spending time on Earth has been a bad influence on "Pink", and being called out by Steven for her condescending treatment makes her ''snap'' to the point of ''physically attacking her''. him''. From Blue's perspective, it's a heartbreaking parallel to a parent unwittingly letting their child fall prey to supposedly bad influences, to the point where said child no longer agrees with their parent's child refusing to acknowledge or appreciate the love and support their given, or having their way of thinking clash with that of the parent's]].and strains their relationship]].
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* AloofBigSister: Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back". "Now We're Only Falling Apart" even has her callously reject Pink's offer to [[spoiler:spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. "Together Alone" has her angrily telling "Pink" to "quit fooling around".]]
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* AloofBigSister: Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back".Back", though she ''tries'' to encourage her to be a good Diamond. "Now We're Only Falling Apart" even has her callously reject Pink's offer to [[spoiler:spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. "Together Alone" has her angrily telling "Pink" to "quit fooling around".]]
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* CharacterDevelopment: While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a ''lot'' since the Rebellion and Pink Diamond's death. [[spoiler:She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink. However, once everyone returns to Homeworld after finding "Pink Diamond", Blue reverts to her old aloof, controlling behavior by expecting Steven to host a royal ball exactly to the Diamonds' standards, and when Steven breaks protocol by dancing and fusing with Connie into Stevonnie, Blue ''threatens'' to unfuse them herself. The "Battle of Heart and Mind" promo has Blue reaching her RageBreakingPoint by ''blasting'' Steven with an energy beam]].
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* CharacterDevelopment: While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a ''lot'' since the Rebellion and Pink Diamond's death. [[spoiler:She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink. However, once everyone returns to Homeworld after finding "Pink Diamond", Blue reverts to her old aloof, controlling behavior by expecting Steven to host a royal ball exactly to the Diamonds' standards, and when Steven breaks protocol by dancing and fusing with Connie into Stevonnie, Blue ''threatens'' to unfuse them herself. The "Battle of Heart and "Change Your Mind" promo has Blue reaching her RageBreakingPoint by ''blasting'' Steven with an energy beam]].
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* FiveStagesOfGrief: In the modern day, she's very clearly in the Depression stage and has been for quite some time. It's unclear if her actions during the Rebellion were influenced by the Anger stage though. To a lesser extent, she's also stuck at Bargaining, as she hoards anything and everything that belonged to Pink Diamond. It's a major reason she brought Greg (a native to Pink's "home planet" Earth) to the Zoo, as well as why she keeps all of Pink's Rose Quartzes bubbled instead of shattering them.
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* FiveStagesOfGrief: FiveStagesOfGrief:
** In the modern day, she's very clearly in the Depression stage and has been for quite some time. It's unclear if her actions during the Rebellion were influenced by the Anger stagethough. though.
** To a lesser extent, she's also stuck at Bargaining, as she hoards anything and everything that belonged to Pink Diamond. It's a major reason she brought Greg (a native to Pink's "home planet" Earth) to the Zoo, as well as why she keeps all of Pink's Rose Quartzes bubbled instead of shattering them. It's also why she decides to go with court formalities in "The Trial", because she wants to know the truth behind Pink's "death".
** In the Diamond Days arc, [[spoiler:she seems to have slipped into Denial. With Steven having revealed himself as Pink's [[{{Reincarnation}} son]], Blue becomes eager to return Homeworld to its Era 1 stages when the Diamond Authority was whole, and keeps calling Steven by his mother's name despite assertions that no, he's not Pink in an organic form. However, when "Pink" continuously breaks the rules and [[CallingTheOldManOut makes it clear to her face that she isn't happy with being patronized]], Blue eventually ''snaps'', to the point of physically assaulting Steven]].
** In the modern day, she's very clearly in the Depression stage and has been for quite some time. It's unclear if her actions during the Rebellion were influenced by the Anger stage
** To a lesser extent, she's also stuck at Bargaining, as she hoards anything and everything that belonged to Pink Diamond. It's a major reason she brought Greg (a native to Pink's "home planet" Earth) to the Zoo, as well as why she keeps all of Pink's Rose Quartzes bubbled instead of shattering them. It's also why she decides to go with court formalities in "The Trial", because she wants to know the truth behind Pink's "death".
** In the Diamond Days arc, [[spoiler:she seems to have slipped into Denial. With Steven having revealed himself as Pink's [[{{Reincarnation}} son]], Blue becomes eager to return Homeworld to its Era 1 stages when the Diamond Authority was whole, and keeps calling Steven by his mother's name despite assertions that no, he's not Pink in an organic form. However, when "Pink" continuously breaks the rules and [[CallingTheOldManOut makes it clear to her face that she isn't happy with being patronized]], Blue eventually ''snaps'', to the point of physically assaulting Steven]].
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* RageBreakingPoint: Implied. [[spoiler:The promo for the "Battle of Heart and Mind" episode has Blue screaming, "That's ENOUGH!" as she blasts Steven with an energy beam]].
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* RageBreakingPoint: Implied. [[spoiler:The promo for the "Battle of Heart and "Change Your Mind" episode has Blue screaming, "That's ENOUGH!" as she blasts Steven with an energy beam]].
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* VillainousBreakdown: [[spoiler:In "Change Your Mind", Blue starts losing her patience with "Pink" (actually Steven), even lamenting that "her" time on Earth had served as a bad influence on "her" moral judgement. When Steven calls her out on her condescending treatment, that's when she reaches her RageBreakingPoint and ''blasts'' him with an energy beam]].
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* ImprobableHairstyle: A large part of her hair comes out of her and ''goes back in'', forming a seamless loop and clearly demonstrating that gems' hair is [[SelfConstructedBeing formed whole]], not grown.
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* ImprobableHairstyle: A large part of her hair comes out of her head and ''goes back in'', forming a seamless loop and clearly demonstrating loop. It's the clearest demonstration that gems' hair is [[SelfConstructedBeing formed whole]], not grown.
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* ImprobableHairstyle: A large part of her hair comes out of her and ''goes back in'', forming a seamless loop and clearly demonstrating that gems' hair is [[SelfConstructedBeing formed whole]], not grown.
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* KickTheDog: Has a bad habit of this.
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* KickTheDog: Has a bad habit of this.KickTheDog:
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* AlienInvasion: [[spoiler:In "Reunited", she and Yellow show up to check up on the Cluster and and attempt to decimate the Crystal Gems. The fact Ruby and Sapphire were having their wedding was just a coincidence.]]
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* AlienInvasion: [[spoiler:In "Reunited", she and Yellow show up to check up on the Cluster and and attempt to decimate the Crystal Gems. The fact Ruby and Sapphire were having their wedding was just a coincidence.]]
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** [[spoiler:Following from the above point, with "Pink Diamond"'s reveal and return, Blue has gotten her closure and is eager to return to life as it was before the Crystal Gem rebellion, believing the Diamonds would become a loving family again... but "Pink" and "her" unorthodox ways continues to frustrate her, and by "Battle of Heart and Mind" when "Pink" makes it clear that "she"'s refusing to follow "her" family's expectations, Blue ''snaps'' to the point of ''physically attacking her''. From Blue's perspective, it's a heartbreaking parallel to a parent's child refusing to acknowledge or appreciate the love and support their given, or having their way of thinking clash with that of the parent's]].
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* BadBoss: Blue Diamond's response to Ruby accidentally averting Sapphire's prophecy (by saving her AKA the job she was assigned to) and for fusing together with her? [[DisproportionateRetribution Why, smash Ruby's gem of course!]]
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* BadBoss: Blue Diamond's response to Ruby accidentally averting Sapphire's prophecy (by saving her AKA her, ''aka'' the job she was assigned to) and for fusing together with her? [[DisproportionateRetribution Why, smash Ruby's gem of course!]]
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* CharacterDevelopment: While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a ''lot'' since the Rebellion and Pink Diamond's death. [[spoiler:She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink.]]
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* CharacterDevelopment: While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a ''lot'' since the Rebellion and Pink Diamond's death. [[spoiler:She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink.]] However, once everyone returns to Homeworld after finding "Pink Diamond", Blue reverts to her old aloof, controlling behavior by expecting Steven to host a royal ball exactly to the Diamonds' standards, and when Steven breaks protocol by dancing and fusing with Connie into Stevonnie, Blue ''threatens'' to unfuse them herself. The "Battle of Heart and Mind" promo has Blue reaching her RageBreakingPoint by ''blasting'' Steven with an energy beam]].
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* ImplacableMan: In "[[Recap/StevenUniverseS5E23Reunited Reunited]]", even with the combined efforts of [[spoiler:the Crystal Gems (including Connie, Bismuth, Peridot and Lapis, who has the ''entire ocean'' as her weapon) [[BossRush all attacking Blue Diamond at once]], all they manage to do is slow her down and knock her off her feet, Blue Diamond easily breaking any hold they have on her and [[NighInvulnerable shrugging off every attack]], including Lapis dropping the barn on her and the Cluster ''slamming Yellow's ship onto her ship ONTO HER!'' And that was ''before'' Yellow Diamond joins in...]]
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* ImplacableMan: In "[[Recap/StevenUniverseS5E23Reunited Reunited]]", even with the combined efforts of [[spoiler:the Crystal Gems (including Connie, Bismuth, Peridot and Lapis, who has the ''entire ocean'' as her weapon) [[BossRush all attacking Blue Diamond at once]], all they manage to do is slow her down and knock her off her feet, Blue Diamond easily breaking any hold they have on her and [[NighInvulnerable shrugging off every attack]], including Lapis dropping the barn on her and the Cluster ''slamming Yellow's ship onto her ship ONTO HER!'' And that was ''before'' [[LightningBrusier Yellow Diamond Diamond]] joins in...]]
* LackOfEmpathy: A variant; of the Diamonds, she ''does'' have empathy, and her emotional side was brought out after Pink Diamond was shattered. However, she's still a BadBoss to her Gem subjects, and while she's a sympathetic character, she represents the negative side-effects of grieving in that she refuses to move on and accept help from those who genuinely care for her, preferring to shift responsibility and blame onto others while leaving herself stuck in a constant, self-defeating cycle. This is represented by her EmotionBomb powers, which makes everyone in the vicinity suffer, while never acknowledging or accepting that she's part of the problem herself.
* RageBreakingPoint: Implied. [[spoiler:The promo for the "Battle of Heart and Mind" episode has Blue screaming, "That's ENOUGH!" as she blasts Steven with an energy beam]].
** Unlike Yellow, whose spiky hair resembles a helmet, Blue's hair resembles cascading waterfalls. Of the Diamonds, she's more prone to uncontrollable bursts of emotion, and ever since Pink Diamond died, her ''head'' has been full of grief, too.
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-->'''Blue:''' ...But this is what you wanted. [[UngratefulBitch You BEGGED us for a colony of your own! And now all you want to do is be rid of it.]] First, too many organics, then their cities were too difficult to dismantle, and now these Crystal Gems? We’re ''tired'' of your excuses, Pink! This "Rose Quartz" can’t hurt you. You can’t be swayed by a few unruly Gems. ''(Pink tries to say something)'' Enough! You must understand... ''you'' are a ''Diamond''. Everyone on this planet is looking to you. You don’t even have to do anything. Just smile and wave. Show everyone you are unfazed by this little... uprising. Your Gems will fall into line and these Crystal Gems will be... no more. As long as you are there to rule, this colony will be completed.
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-->'''Blue:''' ...But this is what you wanted. [[UngratefulBitch [[UngratefulBastard You BEGGED us for a colony of your own! And now all you want to do is be rid of it.]] First, too many organics, then their cities were too difficult to dismantle, and now these Crystal Gems? We’re ''tired'' of your excuses, Pink! This "Rose Quartz" can’t hurt you. You can’t be swayed by a few unruly Gems. ''(Pink tries to say something)'' Enough! You must understand... ''you'' are a ''Diamond''. Everyone on this planet is looking to you. You don’t even have to do anything. Just smile and wave. Show everyone you are unfazed by this little... uprising. Your Gems will fall into line and these Crystal Gems will be... no more. As long as you are there to rule, this colony will be completed.
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** In "Together Alone", it's revealed that she allows Blue Pearl to draw pictures, to the surprise of Yellow Pearl.
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* AloofBigSister: Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back". "Now We're Only Falling Apart" even has her callously reject Pink's offer to [[spoiler:spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. A promo for "Diamond Days" has her angrily telling "Pink" to "quit fooling around".]]
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* AloofBigSister: Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back". "Now We're Only Falling Apart" even has her callously reject Pink's offer to [[spoiler:spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. A promo for "Diamond Days" "Together Alone" has her angrily telling "Pink" to "quit fooling around".]]
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* BigSisterBully: Not physically or intentionally, but her constant dismissal of Pink, [[spoiler:combined with her refusal to let Pink spare the Earth, led Pink to dislike Blue and believe she never cared about her. In present day she seems to have [[HeelRealization realized this]], as she [[ItsAllMyFault blames herself]] for Pink's "death" and seems to have come to the conclusion that Pink was right about humanity not deserving to die. A promo for "Diamond Days" has her angrily telling "Pink" to "quit fooling around".]]
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* BigSisterBully: Not physically or intentionally, but her constant dismissal of Pink, [[spoiler:combined with her refusal to let Pink spare the Earth, led Pink to dislike Blue and believe she never cared about her. In present day she seems to have [[HeelRealization realized this]], as she [[ItsAllMyFault blames herself]] for Pink's "death" and seems to have come to the conclusion that Pink was right about humanity not deserving to die. A promo for "Diamond Days" "Together Alone" has her angrily telling "Pink" to "quit fooling around".]]
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* PetTheDog: Since she seems to be nicer than Yellow Diamond, she has quite a few.
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* PetTheDog: Since she seems to be nicer than Like Yellow Diamond, she has quite a few.
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* ThisCannotBe: [[spoiler:A rare not-entirely-evil example. At the end of "Reunited", Steven finally manages to send a psychic message that he has Pink Diamond's Gem. Blue's response? A soft "Impossible..."]]
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* ThisCannotBe: ThisCannotBe:
** [[spoiler:A rare not-entirely-evil example. At the end of "Reunited", Steven finally manages to send a psychic message that he has Pink Diamond's Gem. Blue's response? A soft "Impossible..."]]
** [[spoiler:A rare not-entirely-evil example. At the end of "Reunited", Steven finally manages to send a psychic message that he has Pink Diamond's Gem. Blue's response? A soft "Impossible..."]]
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ultrablobz_by_koo.png]][[caption-width-right:250:[[labelnote:Click here to see her mural.]]https://static.tvtropes.org/pmwiki/pub/images/blue_diamond_mural.png[[/labelnote]]]]
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* KickTheDog: Has a bad habit of this, but not to the same extent as Yellow Diamond.
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* KickTheDog: Has a bad habit of this, but not to the same extent as Yellow Diamond.this.
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** She just ''laughs'' at Garnet for the latter being a cross-Gem Fusion.
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[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/blue_d_32.png]][[caption-width-right:250:[[labelnote:Click here to see her mural.]]https://static.tvtropes.org/pmwiki/pub/images/blue_diamond_mural.png[[/labelnote]]]]
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She's Affably Evil, but still not overall a good person.
Deleted line(s) 155 (click to see context) :
* NiceGirl: Is usually kind and friendlier than Yellow Diamond [[BewareTheNiceOnes unless provoked.]] Played straight after [[spoiler: learning the truth about Pink Diamond’s whereabouts. She isn't even hostile towards ''Garnet''.]]
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The power isn't CAUSING her grief in any way.
Deleted line(s) 51 (click to see context) :
* BlessedWithSuck: Her sadness bomb is powerful, but since it works by imposing Blue Diamond's feelings on other gems, it's likely that it's only that strong because Blue lost a family member she was very close to and then was left to deal with her grief without any real sympathy for millennia, which left her so broken that only Lapis Lazuli can out-tragic backstory her, and even then Lapis shed a SingleTear. Yeah, it's good in a fight, but she would definitely be a happier Gem without it.
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* ArchEnemy: To Ruby and Sapphire, and their fused form Garnet. While any one of the Diamonds is enough to put her on edge, Garnet shows the most hostility towards Blue Diamond for being the first real obstacle to their love, trying to have Ruby and Sapphire shattered for daring to fuse in her presence (even though it was an accident). Blue herself [[UnknownRival seems to have forgotten about them]], but still makes her disapproval of fusion insultingly clear.
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* ArchEnemy: To Ruby and Sapphire, and their fused form Garnet. While any one of the Diamonds is enough to put her on edge, Garnet shows the most hostility towards Blue Diamond for being the first real obstacle to their love, trying to have Ruby and Sapphire shattered for daring to fuse in her presence (even though it was an accident). Blue herself [[UnknownRival seems to have forgotten about barely remembers them]], but still makes her disapproval of fusion insultingly clear.
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That's not sincere confusion, she's being extremely mocking.
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** A promo for "Diamond Days" has her confused as to why [[spoiler:Garnet would... call herself a Garnet.]]
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* ArchEnemy: To Ruby and Sapphire, and their fused form Garnet. While any one of the Diamonds is enough to put her on edge, Garnet shows the most hostility towards Blue Diamond for being the first real obstacle for their love, trying to have Ruby and Sapphire shattered for daring to fuse in her presence (even though it was an accident). Blue herself [[UnknownRival seems to have forgotten about them]], but still makes her disapproval of fusion insultingly clear.
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* ArchEnemy: To Ruby and Sapphire, and their fused form Garnet. While any one of the Diamonds is enough to put her on edge, Garnet shows the most hostility towards Blue Diamond for being the first real obstacle for to their love, trying to have Ruby and Sapphire shattered for daring to fuse in her presence (even though it was an accident). Blue herself [[UnknownRival seems to have forgotten about them]], but still makes her disapproval of fusion insultingly clear.
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* ArchEnemy: To Ruby and Sapphire, and their fused form Garnet. While any one of the Diamonds is enough to put her on edge, Garnet shows the most hostility towards Blue Diamond for being the first real obstacle for their love, trying to have Ruby and Sapphire shattered for daring to fuse in her presence (even though it was an accident). Blue herself [[UnknownRival seems to have forgotten about them]], but still makes her disapproval of fusion insultingly clear.
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** Upon discovering her Pearl had an interest in art, rather than crushing this hobby outside her duties like most Gems would, Blue found a socially acceptable way for her to indulge it by making her the artist for Homeworld's trials.
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Hartman Hips is for characters with notably wider hips than both waist and chest measurements.
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* HartmanHips: She has curvy hips that are most noticeably prominent in "Reunited".
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!!Blue Diamond
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!!!'''Voiced by:''' Lisa Hannigan
->''"You cannot fathom how much I've mourned, what thousands of years of grief has done to me!"''
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->'''Voiced by:''' Lisa Hannigan\\\
''"You cannot fathom how much I've mourned, what thousands of years of grief has done to me!"''
''"You cannot fathom how much I've mourned, what thousands of years of grief has done to me!"''
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''"You cannot fathom how much I've mourned, what thousands of years of grief has done to me!"''
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* {{Ambadassador}}: Word of God describes blue Gems as typically created with diplomatic skills and Blue has been established to be in charge of Homeworld’s court system. [[spoiler:"Reunited" shows that despite not being in charge of the military, she is a dangerous warrior by herself that requires absolute teamwork from the Crystal Gems just to bring her to a knee. In fact the episode showed that if motivated enough she’s willing to get her hands dirty, which she does to get vengeance against the Crystal Gems despite Yellow already trying to force the Cluster to emerge.]]
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* {{Ambadassador}}: Word of God describes blue Gems as typically created with diplomatic skills and Blue has been established to be in charge of Homeworld’s court system. [[spoiler:"Reunited" shows that despite not being in charge of the military, she is a dangerous warrior by herself that requires absolute teamwork from the Crystal Gems just to bring her to a knee. In fact the episode showed that if motivated enough she’s she’s willing to get her hands dirty, which she does to get vengeance against the Crystal Gems despite Yellow already trying to force the Cluster to emerge.]]
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[[center: [-[[Characters/StevenUniverse Main Character Index]] | [[Characters/StevenUniverseCrystalGems Crystal Gems]] | [[Characters/StevenUniverseStevenQuartzUniverse Steven Quartz Universe]] | [[Characters/StevenUniverseGarnet Garnet]] | [[Characters/StevenUniverseAmethyst Amethyst]] | [[Characters/StevenUniversePearl Pearl]] | [[Characters/StevenUniverseRoseQuartz Rose Quartz]] | [[Characters/StevenUniverseConnieMaheswaran Connie Maheswaran]] | [[Characters/StevenUniversePeridot Peridot]] | [[Characters/StevenUniverseLapisLazuli Lapis Lazuli]] | [[Characters/StevenUniverseGemFusions Gem Fusions]] | [[Characters/StevenUniverseHomeworldGems Homeworld Gems]] | [[Characters/StevenUniverseDiamondAuthority Diamond Authority]] | [[Characters/StevenUniverseYellowDiamond Yellow Diamond]] | '''Blue Diamond''' | [[Characters/StevenUniversePinkDiamond Pink Diamond]] | [[Characters/StevenUniverseYellowDiamondsCourt Yellow Diamond's Court]] | [[Characters/StevenUniverseJasper Jasper]] | [[Characters/StevenUniverseOffColors Off Colors]] | [[Characters/StevenUniverseGemMonsters Gem Monsters]] | [[Characters/StevenUniverseHumans Humans]] | [[Characters/StevenUniverseGregUniverse Greg Universe]] | [[Characters/StevenUniverseLarsBarriga Lars Barriga]] | [[Characters/StevenUniverseOtherThreats Other Threats]] | [[Characters/StevenUniverseS1E33GarnetsUniverse Garnet's Universe]]]]-]
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[[center: [-[[Characters/StevenUniverse Main Character Index]] | [[Characters/StevenUniverseCrystalGems Crystal Gems]] | [[Characters/StevenUniverseStevenQuartzUniverse Steven Quartz Universe]] | [[Characters/StevenUniverseGarnet Garnet]] | [[Characters/StevenUniverseAmethyst Amethyst]] | [[Characters/StevenUniversePearl Pearl]] | [[Characters/StevenUniverseRoseQuartz Rose Quartz]] | [[Characters/StevenUniverseConnieMaheswaran Connie Maheswaran]] | [[Characters/StevenUniversePeridot Peridot]] | [[Characters/StevenUniverseLapisLazuli Lapis Lazuli]] | [[Characters/StevenUniverseGemFusions Gem Fusions]] | [[Characters/StevenUniverseHomeworldGems Homeworld Gems]] | [[Characters/StevenUniverseDiamondAuthority Diamond Authority]] | [[Characters/StevenUniverseYellowDiamond Yellow Diamond]] | '''Blue Diamond''' | [[Characters/StevenUniversePinkDiamond Pink Diamond]] | [[Characters/StevenUniverseWhiteDiamond White Diamond]] | [[Characters/StevenUniverseYellowDiamondsCourt Yellow Diamond's Court]] | [[Characters/StevenUniverseJasper Jasper]] | [[Characters/StevenUniverseOffColors Off Colors]] | [[Characters/StevenUniverseGemMonsters Gem Monsters]] | [[Characters/StevenUniverseHumans Humans]] | [[Characters/StevenUniverseGregUniverse Greg Universe]] | [[Characters/StevenUniverseLarsBarriga Lars Barriga]] | [[Characters/StevenUniverseOtherThreats Other Threats]] | [[Characters/StevenUniverseS1E33GarnetsUniverse Garnet's Universe]]]]-]
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[[center: [-[[Characters/StevenUniverse Main Character Index]] | [[Characters/StevenUniverseCrystalGems Crystal Gems]] | [[Characters/StevenUniverseStevenQuartzUniverse Steven Quartz Universe]] | [[Characters/StevenUniverseGarnet Garnet]] | [[Characters/StevenUniverseAmethyst Amethyst]] | [[Characters/StevenUniversePearl Pearl]] | [[Characters/StevenUniverseRoseQuartz Rose Quartz]] | [[Characters/StevenUniverseConnieMaheswaran Connie Maheswaran]] | [[Characters/StevenUniversePeridot Peridot]] | [[Characters/StevenUniverseLapisLazuli Lapis Lazuli]] | [[Characters/StevenUniverseGemFusions Gem Fusions]] | [[Characters/StevenUniverseHomeworldGems Homeworld Gems]] | [[Characters/StevenUniverseDiamondAuthority Diamond Authority]] | [[Characters/StevenUniverseYellowDiamond Yellow Diamond]] | '''Blue Diamond''' | [[Characters/StevenUniversePinkDiamond Pink Diamond]] | [[Characters/StevenUniverseYellowDiamondsCourt Yellow Diamond's Court]] | [[Characters/StevenUniverseJasper Jasper]] | [[Characters/StevenUniverseOffColors Off Colors]] | [[Characters/StevenUniverseGemMonsters Gem Monsters]] | [[Characters/StevenUniverseHumans Humans]] | [[Characters/StevenUniverseGregUniverse Greg Universe]] | [[Characters/StevenUniverseLarsBarriga Lars Barriga]] | [[Characters/StevenUniverseOtherThreats Other Threats]] | [[Characters/StevenUniverseS1E33GarnetsUniverse Garnet's Universe]]]]-]
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!!Blue Diamond
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/blue_d_32.png]][[caption-width-right:250:[[labelnote:Click here to see her mural.]]https://static.tvtropes.org/pmwiki/pub/images/blue_diamond_mural.png[[/labelnote]]]]
->'''Voiced by:''' Lisa Hannigan\\\
''"You cannot fathom how much I've mourned, what thousands of years of grief has done to me!"''
The second Diamond mentioned and the first to appear in the series proper in "The Answer". She was at the Sky Arena during Rose's rebellion, and Sapphire used to report directly to her. She leads Homeworld's diplomatic Gems, and may be the blue Gem on the mural from "Serious Steven".
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* {{Adorkable}}: [[WhenSheSmiles When she's happy]] she tends to become this.
** In "Steven's Dream" she cheers up after she has a meaningful conversation with Greg during one of her secret visits to Pink's shattering site. The way she talks about how she shouldn't even be on Earth is similar to a teenager who snuck out of the house at night, something she doesn't want her "mother" and "older sister" to know about, and when she finally decides to [[ImTakingHerHomeWithMe take Greg back with her]] she has a downright goofy smile on her face, and doesn't notice she's [[AndCallHimGeorge holding Greg too tightly]].
** [[spoiler:In "Legs From Here to Homeworld", she looks just adorable when crying TearsOfJoy over Pink [[NotQuiteDead still being alive]] (in a sense) and nuzzling Steven against her cheek, but she again doesn't notice that she [[AndCallHimGeorge is squishing him just a bit]]. She also seems to become amused by Steven's curiosity around things he should know about as "Pink" and cracks a few smiles at Yellow's growing frustration over the entire thing.]]
** In "Familiar", [[spoiler:she's absolutely delighted to see Steven again because Pink always made her happy, and there is no change from the way Pink acted thousands of years ago to how Steven acts presently. The only difference she notes is calling "Pink" Steven now, which she precedes to say multiple times with emphasis on different syllables because she thinks it sounds funny.]]
** A promo for "Diamond Days" has her confused as to why [[spoiler:Garnet would... call herself a Garnet.]]
* AdultFear:
** Her grief for her "sister" Pink echoes what most parents fear — losing one's child, and the struggle to move on from it. Moreover, in "The Trial", while confronting "Rose" (actually Steven claiming to be her), she acts like an angry, grieving mother who wants justice for Pink's murderer.
** In "Reunited", when she finally gets the chance to avenge Pink's death, she's faced with the harsh truth: [[spoiler:Getting revenge won't make everything better. The Pink she knew is already gone, and pursuing further action would only make more people suffer]].
** [[spoiler:In "Legs From Here to Homeworld", she discovers that she and the other Diamonds launched their attack on Earth while Pink Diamond was on it.]]
* AffablyEvil: Is surprisingly friendly and cordial to Greg before kidnapping him for her Human Zoo, which she sees as an act of kindness to Greg due to her believing that the Cluster is still going to destroy the Earth. [[spoiler:She also ceases her hostility towards the Crystal Gems after finding out that Rose/Steven is Pink Diamond.]]
* AlienInvasion: [[spoiler:In "Reunited", she and Yellow show up to check up on the Cluster and and attempt to decimate the Crystal Gems. The fact Ruby and Sapphire were having their wedding was just a coincidence.]]
* {{Ambadassador}}: Word of God describes blue Gems as typically created with diplomatic skills and Blue has been established to be in charge of Homeworld’s court system. [[spoiler:"Reunited" shows that despite not being in charge of the military, she is a dangerous warrior by herself that requires absolute teamwork from the Crystal Gems just to bring her to a knee. In fact the episode showed that if motivated enough she’s willing to get her hands dirty, which she does to get vengeance against the Crystal Gems despite Yellow already trying to force the Cluster to emerge.]]
* AloofBigSister: Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back". "Now We're Only Falling Apart" even has her callously reject Pink's offer to [[spoiler:spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. A promo for "Diamond Days" has her angrily telling "Pink" to "quit fooling around".]]
* ArcVillain:
** She's the main antagonist of Ruby and Sapphire's love story.
** She sets the events of "[[RescueArc Out of This World]]" into motion when she "rescues" Greg, although she is never confronted and Holly Blue Agate is the one who directly opposes the Crystal Gems.
* AstonishinglyAppropriateAppearance: She has droopy, sorrowful eyes, is colored blue, and wears a long veil. She's in perpetual mourning.
* TheAtoner: [[spoiler:She wishes to make it up to Pink for ignoring her pleas to spare the Earth by preserving Pink's legacy.]]
* AxCrazy: Downplayed; while she's quite calm normally, her depression makes her very emotionally unstable when provoked-she is quite quick to [[HairTriggerTemper anger]] and DisproportionateRetribution. It's not yet clear if her violent anger was a result of losing Pink Diamond or not.
* BadBoss: Blue Diamond's response to Ruby accidentally averting Sapphire's prophecy (by saving her AKA the job she was assigned to) and for fusing together with her? [[DisproportionateRetribution Why, smash Ruby's gem of course!]]
* BarehandedBladeBlock: She stops a jumping sword attack from Connie with one hand, then effortlessly shatters Rose Quartz's sword.
* BecauseYouWereNiceToMe: It's implied that in-between dealing with {{Sycophantic Servant}}s, and Yellow Diamond's attempts to destroy everything related to Pink Diamond and [[QuitYourWhining seeing Blue Diamond's feelings as useless]], Blue Diamond didn't have the time or place to properly vent and grieve. Then comes [[NiceGuy Greg]], a mere human who not only takes the time to listen to Blue Diamond's thoughts, but tries to comfort her instead of dismissing her feelings or forcing her to move on. Blue Diamond takes such a liking to him that she decides to take him with her to the Zoo so he'd be spared the destruction of the Earth by the Cluster, [[DramaticIrony unaware it'd been neutralized by the Crystal Gems]].
* BeamSpam: Has the ability to manipulate energy, which includes making it rain energy beams.
* BenevolentBoss: She comes off as one in "The Trial", as she summons her palanquin for Defense Zircon to use for her argument when the latter requests her to, and later steps in on her behalf when Yellow poofs her.
* BerserkButton:
** ''Don't'' interfere with her attempts to get to the bottom of how Pink Diamond was shattered, even if you're Yellow Diamond. [[spoiler:Fortunately, her reaction to the truth is far more pleasant than one would expect.]]
** Rose's sword, given her reaction at the trial, [[spoiler:and once she actually sees it in "Reunited" she ''[[OOCIsSeriousBusiness stops]]'' crying and goes into an earth shaking rage before proceeding to break it like it was a toothpick.]]
* BewareTheNiceOnes: While outwardly more sympathetic than most Homeworld Gems, we're occasionally reminded that she's still very much not someone to be trifled with. In particular, she's so bent on revenge against Rose that she specifically wants to hear what Rose herself thinks her plan is, so she can do something ''worse''.
** Also, despite being meek and/or demure around Yellow Diamond, when [[spoiler:evidence starts cropping up that ''her fellow Diamonds'' might have been responsible for Pink Diamond's shattering]], she actually starts ''shouting.''
** Seen again in [[spoiler:"Reunited". She's a ''terrifyingly'' capable warrior, using her emotion-based powers to effortlessly incapacitate the entire Crystal Gem team. It was only Lapis Lazuli, whose [[DisabilityImmunity extremely tragic past made her immune to Blue's grief wave]], that allowed them to temporarily stun her. And even then, she was back up in seconds.]]
* BigBadDuumvirate: Often serves in this role with Yellow Diamond. [[spoiler:They even invade the Earth together.]]
* BigSisterBully: Not physically or intentionally, but her constant dismissal of Pink, [[spoiler:combined with her refusal to let Pink spare the Earth, led Pink to dislike Blue and believe she never cared about her. In present day she seems to have [[HeelRealization realized this]], as she [[ItsAllMyFault blames herself]] for Pink's "death" and seems to have come to the conclusion that Pink was right about humanity not deserving to die. A promo for "Diamond Days" has her angrily telling "Pink" to "quit fooling around".]]
* BigSisterInstinct: In a flashback, Blue at least tries to thoroughly praise and encourage Pink Diamond in light of the rebellion, a stark contrast to Yellow simply turning her back on the latter. It doesn't actually ''work'' [[spoiler:because she misunderstood Pink's motivation]] and comes off as CondescendingCompassion, but she gets points for trying, unlike Yellow, who was straight-out ignoring Pink. In "Familiar", Blue notes that she always loved Pink's cheerful personality.
* BitchInSheepsClothing: While not an unsympathetic character, Blue's role as the softer foil to Yellow can push her into this. Yellow's hostility is very visible and stated easily while Blue's isn't always evident but it's still there. Blue always comes across as the more empathetic of the two, but her CondescendingCompassion and infantilization of Pink strike at a deeper level than Yellow's bluntness. [[spoiler:It's especially apparent in scenes like when Steven meets her in the pool; Blue seems receptive at first but by the end of the conversation it's clear she doesn't "see" him as anything other than a facade Pink put on and when faced with Garnet she only acknowledges the Gems that make her rather than as her own person.]]
* BlessedWithSuck: Her sadness bomb is powerful, but since it works by imposing Blue Diamond's feelings on other gems, it's likely that it's only that strong because Blue lost a family member she was very close to and then was left to deal with her grief without any real sympathy for millennia, which left her so broken that only Lapis Lazuli can out-tragic backstory her, and even then Lapis shed a SingleTear. Yeah, it's good in a fight, but she would definitely be a happier Gem without it.
* BrokenBird: This may overlap with BreakTheHaughty; while it's unknown how "evil" she was before Pink Diamond's shattering, it's clear that it left her in a permanent state of depression in the present for millennia and she's not going to recover from anytime soon.
* ButForMeItWasTuesday: When Blue Diamond sees Sapphire and Ruby face to face, she doesn't even remember them as the Gems she was furious at centuries before, though this is understandable as the event in question was over five thousand years ago. [[spoiler:She remembers who they are in "Reunited" once she sees Garnet.]]
* TheChainsOfCommanding: If Yellow Diamond is telling the truth, Blue Diamond's deep and perpetual grief over the death of Pink Diamond may be causing her to neglect her duties as a leader of Homeworld.
-->'''Yellow Diamond:''' Where's their Diamond when they need her, Blue? ''You've got to be a leader, Blue!''
* CharacterDevelopment: While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a ''lot'' since the Rebellion and Pink Diamond's death. [[spoiler:She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink.]]
* CoolAunt: [[spoiler:After realizing Steven is technically Pink, she becomes far kinder, more supportive, and considerate towards him than she was to Pink. Where Yellow still has some harshness towards him, Blue is quick to come to his defense and instantly jumps in to try and help heal Centipeetle — when Yellow near instantly writes it off as a lost cause — because it's important to "Pink". "Familiar" briefly has her calling him "Steven" instead of "Pink".]]
* CostumeEvolution: The Moon base mural depicts Blue Diamond with a bare head and darker colored hair. When Blue Diamond appears in "The Answer" and "Steven's Dream", she wears a dark blue cowl and has bluish-white hair.
* CreateYourOwnHero: [[spoiler:If she hadn’t been so quick to turn against Ruby and Sapphire for fusing into Garnet, it probably would have never resulted in the Crystal Gems and made Pink try to make Earth a home for dissatisfied and outcast gems.]]
* CreepyShadowedUndereyes: She has heavy shadows under her eyes that are a darker shade of blue than the rest of her face, [[ExhaustedEyeBags ostensibly from grief]] over losing Pink Diamond. Note that, in the flashback in "Now We're Only Falling Apart" where we see her face, she ''didn't'' have these, only because Pink was still alive then.
* CripplingOverspecialization: Her EmotionBomb is so powerful that she seems to use it as a crutch in combat, to the point that she doesn't appear to know how to fight properly without it. It's telling that when [[spoiler:Lapis]] shrugs it off her only backup plan is to bombard her opponent with magic until they poof.
* CurseOfBabel: She was able to temporarily restore Nephrite's speech, implying that this part of the corruption was her doing.
* CurtainsMatchTheWindows: {{Downplayed}}. Her hair ''is'' blue, but quite light when in comparison to her eyes.
* DarkIsEvil: Well, more of an AntiVillain, really, but her overall dark color scheme and shadowed face match her occasional cruelty and indifference well enough.
* DarkIsNotEvil: [[spoiler: She becomes this after Steven reveals to her the truth of Pink Diamond’s whereabouts.]]
* DavidVersusGoliath: [[spoiler:What the fight between her and the Crystal Gems amounts to in "Reunited". Unfortunately for them, this Goliath is too damn hard to take down even with Lapis' help.]]
* DeathGlare: [[spoiler:Gives two to Steven in the "Wanted" arc.]] Before that she gave one to Sapphire in "That Will Be All".
-->'''Blue Diamond:''' [[spoiler:I want to know what SHE thinks we're going to do with her. ''Because I want to do something '''worse'''.'']]
** [[spoiler:Shows up again in "Reunited". As the Crystal Gems stand on the beach to fight her, she stares at them with murder in her eyes, and gives a big absolutely terrifying one to Connie when she attacks her with Rose's sword]].
* DeathSeeker: Or possibly doesn't care whether she dies or not. She sometimes visits Pink Diamond's grave on Earth even though, as far as she knows, the Cluster could become active at any moment.
* DisproportionateRetribution: She threatened to ''smash'' Ruby's gem, for fusing with a courtly Gem like Sapphire and "letting the rebels escape". This can be overlooked to some degree in that Rubies are ''literally'' RedShirts, and Ruby herself was confused over Sapphire's actions ''because'' Ruby knew she was expendable.
* DissonantSerenity: She's hardly fazed by Sapphire's announcement about an upcoming Rebellion attack, even when Sapphire details losses on Blue Diamond's side. Understandable in the fact that the Gems would've just been poofed, and Sapphire herself even says that she looks forward to seeing her again after she reforms.
* DotingParent: In a flashback on the Moon base in "Can't Go Back", she speaks to Pink Diamond about the latter's first colony in a stern, yet kind way. [[spoiler:That said, Pink Diamond didn't see her that way and believed she and the others never cared at all about her.]] After she learns that [[spoiler:Steven is Pink Diamond reincarnated, the first thing she's shown doing in "Reunited" is crying tears of joy while nuzzling Steven. Later on, Blue is quick to support his decision to try to uncorrupt Centipeetle and is willing to go to Homeworld to talk to White Diamond despite her fear of White.]]
* DramaticallyMissingThePoint: The Human Zoo that was kept in Pink's name? [[spoiler:That was created by Blue, because she misunderstood Pink's desire to preserve Earth]]. And she genuinely thought that [[spoiler:her and Yellow's decision to make Pink a puppet ruler of Earth would help shield her sister from the more difficult aspects of ruling, since she interpreted Pink's excuses as her having a hard time with colonizing Earth. It all backfired ''spectacularly'']].
* TheDreaded: Unlike Yellow's, Blue's entire court is even more visibly terrified of their own Diamond. In "That Will Be All", Blue Diamond struck such fear in her former subject Sapphire that the latter literally started [[BowelBreakingBricks freezing up]], and had to be placated by Ruby holding her hand in secret. "Steven's Dream" shows that even ''[[TheStoic Garnet]]'' is terrified of her.
* DueToTheDead: She secretly visits Earth to pay respects to Pink Diamond's "shattering" site behind Yellow Diamond's back, and knowing she'll disapprove. She also keeps a ShrineToTheFallen by bubbling Pink's Rose Quartzes and preserving her old Human Zoo and bed chambers. Yellow Diamond's efforts to {{Unperson}} Pink and destroy everything related to her, on the other hand, is at their core, someone desecrating a loved one's grave and memory for the sake of repressing her own pain and grief.
* TheEeyore: Ever since Pink Diamond's shattering, she's been depressed and sad all the time — so much that [[TheChainsOfCommanding she began neglecting her leadership duties]].
* EmotionBomb: She has the ability to project her own emotions onto other Gems, and it's potent enough to make every Gem within the area start crying at once and even fall to their knees.
** [[spoiler:We see the full, horrifying extent of this in "Reunited". In earlier episodes, her projection power seemed like something she couldn't control — it only popped up when she felt strong emotion. Then we see that she not only has complete control over it, she knows how to weaponize it. With a single raise of her hand, she takes out the ''whole Crystal Gem team.'' (Barring Connie and Lion, who, as a human and lion, aren't affected at all.)]]
* EvenEvilHasLovedOnes: It's unclear how high she ranks on the 'evil' scale in the present day, but she really seems to care about Yellow and Pink, comforting the former in "That Will Be All" and "The Trial" and having mourned the latter's [[spoiler:supposed]] death for ''five thousand years''.
* EvenEvilHasStandards:
** In contrast to Yellow Diamond, who views organic life as something to be snuffed out, Blue Diamond takes [[CondescendingCompassion a more paternalistic approach]] by keeping humans in a nature preserve in Pink Diamond's memory.
** Despite demanding deference and respect from her subjects, even she doesn't seem to care for displays of excessive brown-nosing, albeit not to the same obvious extent as Yellow.
** During "The Trial", she's very insistent on taking the proceedings seriously (as opposed to Yellow Diamond, who openly treats it as a [[KangarooCourt show trial]]).
* ExcessiveMourning: Pink Diamond died over five thousand years ago. Blue Diamond still mourns her death as though it had happened yesterday. {{Justified|Trope}}, as she's lived for possibly ''eons'', and five thousand years really ''is'' like yesterday for her.
* ExoticEyeDesigns: Like Yellow Diamond, she has diamond-shaped pupils.
* ExpositoryHairstyleChange: While Blue Diamond's pre-Rebellion-era mural depicts her as having flowing blue-black hair, her hair in the present day is shorter and stark white. Blue Diamond's hair likely changed for one of the reasons (besides age) a human's hair might turn white: stress due to her long mourning and grief.
** Then again, Blue is shown in a flashback before Pink's death and has white hair even then, though there aren't bags under her eyes. It's more likely that the mural shows an abstracted version of her dark hood.
* FatalFlaw: Sloth. If Yellow Diamond's song is anything to go by, Blue Diamond is so overwhelmed with grief that she is living in the past and neglecting her duties as a leader.
** This seems to be a subversion after "The Trial", where Blue isn't just grieving, she's unable to accept the official story of her beloved sibling's demise — ''because it makes no sense''. The questions "How could Rose do it?" and "How ''did'' Rose do it?" are tearing her up inside. This, coupled with the fact that Yellow is uninterested in finding the truth, is causing her even more distress. A real-world equivalent would be a grieving person whose sister was murdered [[NeverFoundTheBody but they never located their family member's dead body]]. Little wonder Blue is unable to move on.
* FauxAffablyEvil: She talks in an almost soothing manner, but is also indifferent to her followers at best. Downplayed in the present; she is quite capable of kindness (albeit in the CondescendingCompassion sense), but still hardens when she gets suspicious.
** [[spoiler:It's far more this than AffablyEvil in the past, when Pink tries to convince Blue and Yellow to spare the Earth, where '''Blue''' is the one to talk her down and shut her up. Though she's still noticeably more light than Yellow, whose back is turned from Pink and has absolutely '''nothing''' to say to her sisters.]]
* FiveStagesOfGrief: In the modern day, she's very clearly in the Depression stage and has been for quite some time. It's unclear if her actions during the Rebellion were influenced by the Anger stage though. To a lesser extent, she's also stuck at Bargaining, as she hoards anything and everything that belonged to Pink Diamond. It's a major reason she brought Greg (a native to Pink's "home planet" Earth) to the Zoo, as well as why she keeps all of Pink's Rose Quartzes bubbled instead of shattering them.
* {{Foil}}: To her "sister", Yellow Diamond. Aside from their colors and masculine/feminine personalities, Blue Diamond constantly and obsessively mourns Pink Diamond, collecting everything related to her to preserve Pink's memory, and is so utterly consumed by her own depression that she neglects her duties as ruler of Homeworld.
* FoolishSiblingResponsibleSibling:
** Yellow and Blue (responsible) and Pink (foolish). [[spoiler:After Pink's HeelFaceTurn, the roles are reversed.]]
** This trope is ZigZagged between her and Yellow in the present day during Steven's trial. While Blue does act like a depressed {{NEET}}, at the very least she's insistent on continuing the trial properly. Yellow, on the other hand, while she's determined to keep her forces in line, she treats the trial like a KangarooCourt.
* ForeheadOfDoom: She has a very tall forehead which adds to her perpetually droopy face.
* ForYourOwnGood: When Pink was reluctant to continue with the Earth colony, she and Yellow directly intervened. She was quite vocal about it, wanting her younger sibling to be as successful as them.
* FragileFlower: Blue Diamond is quite emotionally unstable, unintentionally harmful to those she loves (mainly Yellow Diamond), and extremely self-observed. Grieving certainly only highlighted these features in her, and at this point, the only Gem who could've opened her eyes to it (Yellow) doesn't do so because she's afraid of breaking Blue even further.
* FrickinLaserBeams: Her primary attack in [[Recap/StevenUniverseS5E23Reunited "Reunited"]] is to [[StatusAilment slow down the Crystal Gems]] with {{Emotion Bomb}}s and summoning self-directing {{Hand Blast}}s to barrage the battlefield.
* {{Gasp}}: Blue Diamond reacts this way after Blue Zircon implies [[spoiler:one of the Diamonds shattered Pink]], either for the shock of such sacrilegious declaration, or because it actually ''makes sense'' (Blue Diamond trying to calm Yellow Diamond makes the latter a likely situation). [[spoiler:She also gives one of these in "Reunited", when she realizes that Steven really ''is'' the supposedly-shattered Pink Diamond.]]
* GodSaveUsFromTheQueen: Very queenly (Greg even calls her "Your Highness"), and also very tyrannical. Does not hesitate to order Ruby executed for breaking a taboo, even accidentally while trying to do her job. She may have lightened up in the present day, though how much remains to be seen.
* HairTriggerTemper: Ironically, Blue Diamond's temper can be even ''worse'' than Yellow Diamond's. It took one of her followers calling her what is probably the equivalent of a Gem slur, and in another case, being accused of murdering her own sister, for Yellow to finally snap and get violent. Blue, on the other hand, was immediately ready to shatter one of her own Gems for accidentally fusing with one of her elites, and totally lost her composure because "Rose Quartz" apparently didn't want to remember the most traumatic event in her life. As mentioned above in AxCrazy, it's unclear if her violent anger is as a result of Pink Diamond's [[spoiler:supposed]] shattering. "Now We're Only Falling Apart" implies that she was like this beforehand considering how [[spoiler:Pink Diamond express fear and guilt for leaving Garnet at her mercy and makes her change her goal from scaring Homeworld off of Earth to making it a home for outcast gems]].
* HartmanHips: She has curvy hips that are most noticeably prominent in "Reunited".
* HeartIsAnAwesomePower: A dark example. Yellow has [[ShockAndAwe electricity-based powers]] which can effortlessly "poof" a Gem, taking them out of commission. Compared to this, Blue's EmotionBomb gift of spreading her feelings to other Gems seems weak... [[spoiler:Then "Reunited" aired, and we see that she can easily weaponize that reverse empathy to completely incapacitate ''every Gem in range.'' Her power is so strong that it unfuses Alexandrite within seconds.]]
* HeavenlyBlue: She is, as her name implies, blue, resembles the Virgin Mary, has blue light attacks and is worshipped as a god. [[LightIsNotGood She is however an antagonist.]] [[spoiler: For most of the series, anyway.]]
* HeelRealization:
** [[DownplayedTrope Has had a partial one]]. Unlike Yellow, she's realized humanity doesn't ''deserve'' to die and has come to respect them. However, she's unable, or unwilling, to go against Yellow and do more than spare a few of them.
** [[spoiler:Unlike Yellow, she seems to have realized she and Yellow were too [[BigSisterBully callous and cruel]] to Pink, to the point of [[ItsAllMyFault blaming herself for her apparent demise]]. When she realized Steven is Pink (in a sense), she stops her rampage and shows she really ''has'' changed, being far kinder and more considerate to him and what he wants.]]
* HiddenEyes: Seems to be a theme with her, as her Pearl, Sapphire, and Blue Diamond herself all cover their eyes.
* HiddenDepths:
** [[spoiler:"Now We're Only Falling Apart" reveals Blue created the human zoo as an attempt to compromise with Pink Diamond’s begging to cease the colonizing of the Earth. Very surprising considering she was as dismissive of organics like Yellow Diamond yet she was able to make sure future generations of Zoomans wouldn’t understand feelings like sadness and pain.]]
** A darker example in "Reunited". [[spoiler:Previously, she had raised her voice on the show twice, both in "That Will Be All" and "The Trial," and she seems almost weak compared to the war-like Yellow. Then we see her battling in action, and... let's just say it's not pretty.]]
*** The same episode demonstrates that she understands just how useless continuing the war with the Crystal Gems is, since no matter how much they suffer it can't bring Pink Diamond back.
* {{Hypocrite}}: In a flashback in "Now We're Only Falling Apart", Pink Diamond is shown to be worried that Blue will scold her for visiting the [[spoiler:Prime Kindergarten]], but in "Steven's Dream", Blue herself is shown going against Yellow's orders and visiting the Earth against her wishes.
* IcyBlueEyes: She has droopy, light blue eyes, which can appear [[InnocentBlueEyes innocent]] when she grieves.
* ImplacableMan: In "[[Recap/StevenUniverseS5E23Reunited Reunited]]", even with the combined efforts of [[spoiler:the Crystal Gems (including Connie, Bismuth, Peridot and Lapis, who has the ''entire ocean'' as her weapon) [[BossRush all attacking Blue Diamond at once]], all they manage to do is slow her down and knock her off her feet, Blue Diamond easily breaking any hold they have on her and [[NighInvulnerable shrugging off every attack]], including Lapis dropping the barn on her and the Cluster ''slamming Yellow's ship onto her ship ONTO HER!'' And that was ''before'' Yellow Diamond joins in...]]
* INeverSaidItWasPoison: Subverted, as she's definitely not [[spoiler:the murderer of her beloved Pink Diamond. She does, however, correct Steven, who had become convinced his mother eventually used Bismuth's [[HeWhoFightsMonsters Breaking Point weapon]] to kill her own Diamond. Blue screamed it was a sword. Bismuth designed Rose's sword to slice through physical forms, but ''never'' shatter the gem itself.]]
* InTheHood: She wears a long blue cloak that does a good job of [[HiddenEyes obscuring her eyes]]. It gives her a likeness to the Virgin Mary when she stands.
* IronicName: Blue diamonds represent peace, spirituality, and good health, which is ironic, given that her lasting grief and mourning over Pink is ''far'' from an improvement to her well-being.
* ItsAllAboutMe: Grieving has made Blue increasingly self-centered, causing her to push away her responsibilities to the Gems who follow her and reject Yellow's attempts to help her. Yet this selfishness comes with minimal self-reflection, as it's clear she's putting the burden of Pink's demise on everyone but herself.
* ItsAllMyFault: She blames herself for not preventing Pink Diamond's shattering at the hands of Rose, a sentiment that she privately expresses to Pink Diamond's ruined palanquin while visiting Earth in "Steven's Dream". "Can't Go Back" reveals she pressured Pink Diamond into continuing the war for Earth [[spoiler:even though Pink wanted to just leave Earth and the Crystal Gems alone]], explaining why she feels that way.
* KickTheDog: Has a bad habit of this, but not to the same extent as Yellow Diamond.
** In Ruby and Sapphire's love story, she threatens to have Ruby shattered for something that was an obvious accident.
** She treats both Holly Blue and Sapphire with utter ''disdain'' when they interrupt her chat with Yellow Diamond.
* KickTheMoralityPet: She and Yellow Diamond perform a dual one in a flashback in "Now We're Only Falling Apart", in which they reject Pink's offer to [[spoiler:spare the Earth]].
* KnowWhenToFoldEm: In "The Answer", she knows her limits and tries to escape the rebels on her palanquin.
* LadyOfBlackMagic: Her regal robes and hood invoke a resemblance to a classical witch, and she primarily uses magic in combat either in the form of her [[EmotionBomb depressive aura]] or [[BeamSpam energy blasts]].
* LargeAndInCharge: She's only slightly shorter than Yellow, as seen when the two stand side by side in the fourth and fifth seasons. The height difference is probably because Yellow wears heels.
* LaserGuidedKarma: [[spoiler:She gets hit by this ''hard''. Since she was such a BadBoss towards her subjects and was so [[AloofBigSister condescending]] to Pink, the latter ends up [[FakingTheDead faking her death]], which makes her cross the DespairEventHorizon and mourn Pink's "death" for ''millennia''.]]
* LeanAndMean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is {{subverted|Trope}} as she is more traditionally feminine-looking than her 'sister' Yellow Diamond with a fuller, more hourglass shape. Whether this is due to Garnet being an UnreliableNarrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known.
* {{Leitmotif}}: Her specific variation of the Diamonds' theme, heard during her meeting with Greg, incorporates a twinkling chiptune not dissimilar to Lapis' celesta.
* LightEmUp: In her battle with the Crystal Gems she throws beams of blue devil light.
* ALighterShadeOfBlack: As opposed to wanting to destroy Earth for the sake of {{Revenge}} (like Yellow Diamond), Blue Diamond wishes Earth wouldn't die (as it's one of the last remnants of Pink Diamond). In fact, she and the human Greg have a moment based around both losing loved ones. She still basically kidnapped him, but it was for more sympathetic reasons than spite. This is on top of her developing a respect for humanity for persevering through life despite, in her eyes, being weak. [[spoiler:Her actions in "The Trial" only lighten her further, as she's a ReasonableAuthorityFigure compared to Yellow, adamantly refusing to cut straight to an execution without going through due process, and giving Steven and his defense lawyer adequate time to speak and defend themselves, even allowing Blue Zircon to present her personal Diamond palanquin as evidence. While she doesn't stop Yellow from poofing both Zircons, she IS furious that Yellow did so in the first place and lets her know it.]]
* LightIsNotGood: Her palanquin, hooded veil and flowing robes offset give her an eerily saintlike appearance. As the rest of these tropes will tell you, she's anything but — or, at least, she was back during the Rebellion. As the ALighterShadeOfBlack entry explains, she's certainly a little better than Yellow Diamond these days.
* LockedOutOfTheLoop: As "The Trial" reveals, she's (almost) completely in the dark about what really happened with Pink Diamond's death.
* LongHairIsFeminine: The Moon base mural depicts her with long black hair, and in the present day her hair is long, flowing, and pale with a "loop" that wraps around her gem.
* MamaBear: It's heavily implied that she and Pink Diamond were very close, and her shattering affected her greatly. Her behavior in "The Trial" is akin to an angry, grieving parent searching for answers and confronting the (supposed) killer of their child on why they did it. [[spoiler:In "Reunited", she takes a personal fight to the Crystal Gems, and very nearly defeats them in a matter of seconds, all because she despises the fact they're sullying Pink's former planet with their presence.]]
* MeaningfulName:
** The Hope Diamond, the world's most famous diamond, is a blue diamond. Blue Diamond seems to be the direct leader of the nobility. The Hope Diamond is also believed to be cursed and bring misfortune to anyone who tries to wear it, which is fitting given Blue Diamond being ''very'' quick to shatter Ruby, and the fact Lapis (who wears Blue Diamond's symbol) has been hit with the most misfortune of ''any'' other being, Gem or human. Blue Diamond herself also suffered the loss of a loved one and has spent much time in constant mourning and heartache. She also has the ability to inflict sadness and sorrow on others.
** When we finally see her again, she's in mourning, and is implied to have been so for the past few ''thousand'' years. Yellow Diamond's VillainSong "What's the Use of Feeling (Blue)?" mixes it with PunnyName; it's like being called "Sad Diamond".
* MoodSwinger:
** She suddenly snaps out of mourning when she's suspicious of Sapphire's (false) claim to have been on a special mission for her. Then Sapphire explains she was taking an opportunity before Earth was destroyed, and Blue Diamond instantly snaps ''back'' to looking miserable.
** In "The Trial" she starts out calm but when she questions "Rose" who lies to her about how Pink was shattered, Blue is enraged for a second before grief and frustration overwhelm her, and she breaks down for a moment.
* MoralMyopia: Blue Diamond had no moral qualms about ordering Ruby's execution, suggesting that she has a harsh standard for Gems that disobey her rules. However, when her sister Pink Diamond was [[spoiler:apparently]] killed, she mourned for ''centuries''. Somewhat justified from the Diamonds' point of view, considering the caste system — Rubies are meant to be expendable soldiers. It doesn't make it any less monstrous, mind you.
* MyGreatestFailure: She and Yellow were tired of Pink's excuses in not completing the Earth colony, reassuring her Rose could do nothing against her, and instructing her to quash the rebellion. Shortly afterwards, news reached her that [[MyGodWhatHaveIdone Pink was shattered by Rose]]. [[spoiler:Her current behavior implies she is also aware her own callousness towards Pink may have contributed to what happened and regrets it.]]
* MysticalWhiteHair: Has long white hair. Her mural, however, depicted her with black hair.
* {{NEET}}: PlayedForDrama; while she is one of distinguished Gems that command everything on Homeworld and other Gem-controlled planets, Blue nowadays does nothing but wallow in her own grief, something Yellow Diamond calls her out on.
* NeverMyFault: In "The Answer", she blames Ruby for not stopping Rose and Pearl when Sapphire predicted it, even though she never did a thing to stop them herself.
* NiceGirl: Is usually kind and friendlier than Yellow Diamond [[BewareTheNiceOnes unless provoked.]] Played straight after [[spoiler: learning the truth about Pink Diamond’s whereabouts. She isn't even hostile towards ''Garnet''.]]
* NiceMeanAndInBetween: [[spoiler:Yellow (mean) is a [[HairTriggerTemper short-tempered]] BadBoss, Blue (in-between), while initially as bad as Yellow, seems to have TookALevelInKindness in recent years thanks to Pink Diamond's "death", and Pink (nice) is an AllLovingHero and a BenevolentBoss who cherishes and wishes to protect organic life.]]
* NighInvulnerability: On par with Yellow Diamond. [[spoiler:She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced.]]
* NobleDemon: She wants to save at least some humans to honor Pink's memory, and she's an impartial and fair judge (of Steven, who we must remind you ''she thinks murdered Pink'').
* NonStandardCharacterDesign: Her appearance borrows heavily from the style of Creator/LeijiMatsumoto to give her "[[https://twitter.com/cartoonnetwork/status/826230013519360000 a strange presence]]".
* NotSoDifferent:
** Greg saw Blue Diamond's loss of Pink Diamond as no different than his loss of Rose. Their experiences with the death of a loved one allowed both of them to bond; what's more, Blue kneels down to look at Greg at eye-level more or less as this happens, which is in its own way acknowledging this trope.
** She's also this to Pearl (at the beginning of the series): both are trying to cope with the death of their loved one in the same way, by constantly grieving and refusing to move on. [[spoiler:Ironically, Greg's, Pearl's and Blue Diamond's loved ones are all the same individual]].
** To Amethyst (post-Gem War). Both are considered the lazy, undisciplined members of their team, lacking proper motivation to work with others due to unresolved emotional growth (Amethyst's inferiority complex being an Earth-born gem and defective, Blue Diamond believing Pink Diamond had died in what may have been a preventable tragedy) and have developed counter-dependent attitudes towards anyone that pushes them over it (Pearl/Yellow).
* OhCrap: Twice in "From Legs to Homeworld". [[spoiler:Once she learns of what the Diamonds' combined attack had ''actually'' done to all the Gems on Earth, she reacts in disbelief and horror. She's also ''terrified'' of incurring White's wrath over the senseless destruction she and the other Diamonds had caused because they all couldn't agree on Earth's colonization, behaving like a child who just realized they had utterly screwed up in a huge way]].
* OnlySaneMan: Blue is determined to find out the truth behind Pink Diamond's demise through court, whereas Yellow is adamant Rose was responsible, going increasingly off the rails and suspiciously [[RevealingCoverup trying to shut down any line of inquiry]].
* OohMeAccentsSlipping: Occasionally betrays hints of an Irish accent. From "Can't Go Back" onward, [[VocalEvolution she speaks entirely with one]].
* ParentalSubstitute: One possible interpretation of her relationship with Pink Diamond, considering that Pink is implied to have been the youngest of the Diamonds and someone had to teach Pink how to behave like a Diamond. [[OutlivingOnesOffspring This makes Blue Diamond's grieving even more tragic]].
* PartingWordsRegret: Implied. The flashback in "Can't Go Back" is implied to be the last conversation she had with Pink before the latter's [[spoiler:faked]] assassination. What she says to her pretty much reads as "stop whining and be a good little PuppetQueen", and she encourages Pink to dismiss Rose Quartz as a threat. No wonder she's so broken up about Pink's passing. In particular, her final sentence was ''"[[TemptingFate As long as you are there to rule]], this colony will be completed."'' [[spoiler:Ironically, Pink Diamond ''didn't'' want the colony to be completed, and took Blue Diamond's words to mean that the only way that Earth could survive was if she removed herself from the equation.]]
* PerpetualFrowner: Her eyes are constantly drooped, and she's barely ever seen not crying.
* PetTheDog: Since she seems to be nicer than Yellow Diamond, she has quite a few.
** Even during the Rebellion, Blue Diamond is shown to have a respect for high-ranking members of her court, as she thanks Sapphire for her vision.
** She is perhaps the first Homeworld Gem to quickly realize that humans are capable of empathy and feeling loss, and she lifts her veil and ''lowers herself to Greg's eye level'' to speak with him as an equal. Her abduction of Greg is because she thinks he doesn't deserve to die; at the time she did not know the Cluster was no longer going to destroy the Earth.
** Her desire to preserve Pink Diamond's legacy includes keeping the humans in the Zoo well cared for and keeping the Earth Quartzes and other Rose Quartzes alive (even if the latter are bubbled), both of which Yellow Diamond finds absurd. She also [[DramaticIrony intended]] [[YouWillBeSpared to save Greg]] by kidnapping him and taking him to the Zoo.
** She keeps the trial going, wanting to hear Steven and his defense Zircon out, and won't execute Steven outright when he demands to be punished for Rose's crimes.
** When Yellow Diamond starts going ballistic on the Zircons [[spoiler:when the Defense one implies that the Diamonds shattered Pink]], Blue steps in on their behalf.
** In spite of harshly scolding Pink Diamond for her supposed ungratefulness in a flashback in "Can't Go Back", she comforts her after seeing that her tone has upset Pink. [[spoiler:Unfortunately, Pink didn't see this as a Pet the Dog moment, instead as a KickTheDog moment.]]
** Despite taking a no-nonsense approach while facing the Crystal Gems, she ceases her hostility after she finds out that [[spoiler:Rose/Steven is Pink Diamond.]]
** She does genuinely care when she [[spoiler:attempts to restore Nephrite]].
* ReasonableAuthorityFigure: Well, when compared to [[AxeCrazy Yellow Diamond]] today, though she was just as bad around Ruby and Sapphire's time. [[spoiler:In "The Trial", she opts to go through "Rose Quartz's" (actually Steven) trial and hear out the defendant rather than going through with Yellow Diamond's wish of a quick execution. When Yellow Diamond goes ballistic from being accused of regicide, Blue Diamond tries to get her to calm down.]]
* PowerIncontinence: Blue's EmotionBomb powers cause any Gems around her to cry her tears, but she can't seem to turn it off. If she has even so much as tears of joy, any Gems around her will be left in various stages between weeping and uncontrollably bawling. This even extends to Pink and Yellow Diamond, to the latter's annoyance.
* RedOniBlueOni:
** Like their respective Pearls, Blue is the... blue to Yellow's red.
** Both she and Yellow serve as the blue to Pink's red, as they are more serious and less exitable than she is.
* RevengeBeforeReason: Subverted. We're led to believe that she wants to avenge Pink in the "Trial", given she wants to do ''something'' terrible to Rose. It turns out, however, that Blue wants answers more than revenge: how did her sister die, and ''why'' is the official story full of holes?
* {{Sadist}}: During "The Trial", Yellow wants to kill Steven in a quick and probably painless way, while Blue implies she wants to torture him. Also, in "Reunited", [[spoiler:when Steven enter the Diamonds's minds, Yellow is only thinking about Pink, while Blue is thinking about how much she wants the Crystal Gems to suffer, and that's not enough to make her feel better.]]
* ScrewThisImOuttaHere: In "The Answer", she flees in her palanquin when Rose and Pearl show up, rather than confront them directly.
* SelfServingMemory: She tells Greg that she and Pink Diamond were "very close", [[spoiler:yet Blue's constant dismissal of Pink, combined with her refusal to let Pink spare the Earth, suggests that their relationship was strained ''at best''. In fact, the only on-screen interactions between Blue and Pink when the latter was still alive have been fairly negative. "Now We're Only Falling Apart" even has Pink, as Rose, regretting leaving Garnet with Blue, implying that she sees Blue as more of a tyrant than a sister. It apparently got so bad that even thousands of years after faking her death, Pink didn't miss Blue at all.]]
* ShadowArchetype: To Lapis and Sapphire, who were both once part of her court.
** Blue, like Sapphire, was close to a red gem (Pink, Ruby), though Blue and Pink are implied to not have been as close as Blue thought. [[spoiler:Unlike Sapphire, who had friends make her see her mistakes, Blue let her position's expectations and her own arrogance influence her relationship with Pink, which both alienated her and drove her away to the point of rebelling in the form of the commander of an intergalactic war. By the time Blue realized her mistake, Pink has faked her death, and Blue wasn't the same since]].
** Blue, like Lapis, endured an equal amount of psychological trauma, which continued to affect them for thousands of years. [[spoiler:Unlike Lapis, Blue hasn't made an effort to try move on from Pink's death, something that Yellow Diamond called her out on in "That Will Be All".]]
* ShoutOut: Her character design is a nod to many of the willowy female characters from Creator/LeijiMatsumoto's works.
* SilkHidingSteel: Most of the time, Blue Diamond is a graceful and demure presence, and seems to defer to Yellow Diamond's more authoritative presence. However, it's hinted that she's got a firmer side to her, as seen by her quiet suspicion of Sapphire's presence in the Zoo at first. [[spoiler:Then, in "The Trial", we see her suddenly standing up to Yellow and engaging her in a ''shouting match''. And in "Reunited", the steel comes fully out as even when her "reverse empathy" power is stopped, she's ''still'' an incredibly powerful warrior who can summon weaponized beams of light and shrug off her own ship slamming into her like it's nothing.]]
* SoftSpokenSadist: [[spoiler: Has shades of this. Yellow's electric energy attacks "poof" Gems instantly, but Blue's ability--forcing any Gem to become overwhelmed with grief and suffering — keeps them fully conscious and aware of every second of the pain. When she uses that very power to incapacitate the Crystal Gems in "Reunited", she softly but intensely says one line: "''You deserve this.''" Ultimately subverted, however, as when Steven sees into her mind, she admits it doesn't make her feel any better at all. If anything it makes her feel ''worse''.]]
* SomeoneToRememberHimBy: A non-child example. Not knowing that the Cluster isn't going to destroy Earth, she kidnaps Greg as a memento of Pink Diamond.
* SouthPaw: Blue nearly always uses her left hand, and her ship is even a left arm.
* StatusAilment: Her {{Emotion Bomb}}s act as this in a battle situation, overwhelming every gem on the beach with overwhelming sadness and defusing Alexandrite in [[Recap/StevenUniverseS5E23Reunited "Reunited"]].
* SuddenlyShouting: "IT WAS A ''SWORD''!" It also applies to when Yellow Diamond starts poofing the Zircons — cue the soft-spoken Blue suddenly jumping forward to grab Yellow and shouting at her to get a hold of herself, and when [[spoiler:she comes face-to-face with Rose's sword in "Reunited"]].
* TaremeEyes: Blue Diamond has large, sad, downward-slanting eyes which fits with [[AstonishinglyAppropriateAppearance her perpetual mourning]].
* TearsOfJoy: [[spoiler:She cries these in "Legs From Here to Homeworld" over sheer joy at seeing Pink (as Steven) again.]]
* ThisCannotBe: [[spoiler:A rare not-entirely-evil example. At the end of "Reunited", Steven finally manages to send a psychic message that he has Pink Diamond's Gem. Blue's response? A soft "Impossible..."]]
** [[spoiler: Also in the same episode was surprise that Lapis Lazuli appears out of nowhere and declared herself a Crystal gem but also that she had resisted her emotion powers suggesting this has never happened before or that it's a rare event.]]
* ThisIsUnforgivable:
** Her reaction to Ruby accidentally fusing with Sapphire is threatening to shatter Ruby's gem in "The Answer".
** In "Reunited", [[spoiler:she tries to murder all of the Crystal Gems for daring to thrive on the planet that belongs to Pink]].
* TokenGoodTeammate: [[DownplayedTrope At least of the remaining three Diamonds]], [[spoiler:given what Pink was]]. Now that we've been introduced to both [[HairTriggerTemper Yellow]] and [[AbusiveParents White Diamond]], Blue seems to stand out as being nicer and being more down-to-earth than them.
* TooImportantToWalk: She's a member of the Great Diamond Authority and travels by palanquin.
* TomboyAndGirlyGirl: The Girly Girl to Yellow Diamond's Tomboy, taking note of their respective feminine and masculine personalities.
* TookALevelInCheerfulness: [[spoiler:She cries TearsOfJoy in "Legs From Here to Homeworld" over sheer joy at having "Pink" back.]]
* TookALevelInJerkass: [[spoiler:To an extent in "Reunited", though it's understandable given her circumstances at the time. She goes to Earth to make the Crystal Gems suffer and takes a no-nonsense approach when facing them.]]
* TookALevelInKindness: She is noticeably nicer and more mature in the present day compared to her extremely callous behavior towards Ruby and Sapphire for accidentally fusing in "The Answer" and her attitude in "Can't Go Back", as she bubbled and protected all the Rose Quartzes from being shattered by Yellow Diamond, and allowed the other Quartzes such as the Amethysts to still be in service [[FantasticRacism regardless of what Homeworld thought of them]]. [[spoiler:Realizing her callousness towards Pink may have contributed to her apparent death may have contributed to this.]]
* TragicKeepsake: Blue Diamond sees anything related to her dead "sister" Pink Diamond as something to preserve and keep around her. She keeps everything from Pink Diamond's empty throne room and the bubbled gems of her former Rose Quartz servants, to the Human Zoo and the Quartzes from the Earth Kindergardens. When Greg, a human from Earth, shows her compassion, Blue Diamond decides to take him, too, in order to save what she believes to be "one last piece of [Pink Diamond's] legacy" from the Cluster. Yellow Diamond derides Blue Diamond's habit of collecting anything related to Pink Diamond as useless clinging to the past. In "Reunited", [[spoiler:when she sees the surviving Crystal Gems and "Rose Quartz" still living on Earth, she is ''furious'', seeing it as a grave affront to Pink's memory]].
* TranquilFury: Like her former subject, Sapphire, she usually keeps her composure even when angry, only displaying cold irritation. It is during the events of "The Trial" that she [[EmotionBomb explodes]], even ''yelling'' at Yellow Diamond [[spoiler:when she goes on a rampage after being accused of killing Pink Diamond]]. [[spoiler:In "Reunited", she remains remarkably soft-spoken even during a pitched battle against the Crystal Gems, despite her words making it clear she feels nothing but anger at their presence.]]
* TrueBlueFemininity: She's a ''blue'' Diamond, after all. This seems to be a theme of her and her court since every Gem shown connected to her so far has been blue. In "Steven's Dream", she wears a simple shoulderless, figure-hugging gown underneath a cloak, reminiscent of old English mourning dress. This in direct contrast to Yellow Diamond's more masculine military jumpsuit.
* TheUnFavourite: Unlike Yellow who holds some resentment, Blue speaks no ill of White, yet did mention to Steven in ''Familiar'' that her attempts to emulate Pink's games and [[BigFun sense of humor]] by simply calling a group of Pyrites "Fool's Gold", backfired and enraged White Diamond.
* TheUnfettered: Back during the Rebellion, she didn't care about the losses that would be on her side. All that mattered to her was that the Gem Rebellion would be over, and Rose and Pearl captured and punished for their actions. In the present, she's actually the more rational between herself and [[RevengeBeforeReason Yellow Diamond]].
* UnskilledButStrong: She's as horrendously powerful as her rank suggests, and shrugs off a ridiculous amount of punishment. [[spoiler:It must be noted however that she ''takes'' a ridiculous amount of punishment in the episode "Reunited", as she barely moves, her melee defense is rudimentary at best, she fails to land decisive hits and lacks any sort of plan to counter Steven's shield. She even has to pause to weep into her hands before her depressive aura can be sent out for the first time. Yellow by comparison turns the fight around in moments, demonstrating that she knows how to properly leverage her advantages. [[JustifiedTrope Justified]] since she is primarily a diplomat, unlike Yellow who is responsible for the military and Pink who fought in the rebellion. Also, it's entirely possible that she has never fought an enemy who could shrug off her EmotionBomb ''and'' shield against her magic projectiles.]]
* UnwittingInstigatorOfDoom: [[spoiler:Tells Pink Diamond that "As long as you are there to rule, this colony will be completed." Unfortunately, Pink ''didn't'' want the colony to be completed, and this is almost certainly what led to her faking her death, and all the disastrous events that brought with it.]]
* UnwittingPawn: [[spoiler:She's unaware Pink has been playing her and Yellow like a fiddle ever since she grew to love the Earth. It gets a bit sad when you remember she genuinely loves Pink.]]
* VengeanceFeelsEmpty: [[spoiler:When Steven sees into her mind, she admits harming the Crystal Gems doesn't bring her any joy ''or'' closure on Pink's death. If anything, it makes her feel ''worse'' by reminding her of Pink.]]
-->'''Blue:''' What good will any of this do? The more I make these Gems suffer, [[spoiler:the more I long to see you again, Pink.]]
* VillainHasAPoint: While she's obviously trying to [[spoiler:murder Steven during "The Trial", she is right that the court has to observe the formalities, like the defense lawyer and defendant being allowed to make a statement, and said lawyer providing evidence of Rose Quartz's possible innocence. The formalities in fact reveal a lot of holes in Pink's death. Blue has been sensing all is not right with the official story and prods him, demanding answers. And considering she thinks that Steven murdered her little sister, it's actually really merciful of her to correct him on the details of the murder, angry and sad as she is.]]
* VisualPun:
** When we finally see her without the veil, she's grieving, and not only is she ''blue'', but she has a ''long face''. And unlike the cut of Yellow Diamond's gem, Blue's is uneven by being longer at the top and shorter at the bottom, giving it a similar appearance to a teardrop — ever since Pink Diamond died, her heart has been full of grief.
** Her emotional powers force every Gem in her vicinity to feel as sad as her. ''Misery loves company''.
* WeHaveReserves: More forgivable than most cases considering Gems can reform and would be good as new given a few weeks at the absolute most, but she doesn't bat an eye over 'casualties' on her side as long as the Crystal Gems get captured.
* WellIntentionedExtremist: Her words to Pink Diamond in "Can't Go Back" at least ''try'' to have some encouragement inside:
-->'''Blue:''' ...But this is what you wanted. [[UngratefulBitch You BEGGED us for a colony of your own! And now all you want to do is be rid of it.]] First, too many organics, then their cities were too difficult to dismantle, and now these Crystal Gems? We’re ''tired'' of your excuses, Pink! This "Rose Quartz" can’t hurt you. You can’t be swayed by a few unruly Gems. ''(Pink tries to say something)'' Enough! You must understand... ''you'' are a ''Diamond''. Everyone on this planet is looking to you. You don’t even have to do anything. Just smile and wave. Show everyone you are unfazed by this little... uprising. Your Gems will fall into line and these Crystal Gems will be... no more. As long as you are there to rule, this colony will be completed.
* WhatYouAreInTheDark: She secretly kept visiting Pink Diamond's ruined palanquin on Earth at the site of her shattering thousands of years after the Rebellion, knowing Yellow Diamond wouldn't approve of her being in a place where their 'sister' was killed by a Homeworld traitor.
* WhenSheSmiles: When she breaks out of her depression and smiles her more elegant and regal features allow her to come off as endearing albeit a tad {{Adorkable}}. She gives off a cute light smile shortly after meeting Greg in "Steven's Dream". [[spoiler:and in "Legs from Here to Homeworld" she shows off a larger adorable smile, along with several more amused smiles while crying TearsOfJoy when she spends time with Yellow and "Pink".]]
* WhiteHairBlackHeart: Without the veil, she's shown to have bluish-white hair, though it's played with; she was shown to be extremely callous towards Ruby and Sapphire for accidentally fusing in "The Answer", but her cruelty doesn't extend to her fellow Diamonds, who she deeply cares for, and she seems to have developed a sense of empathy for humans as opposed to Yellow's outright contempt for organic life.
* TheWomanWearingTheQueenlyMask:
** She's highly revered by her Homeworld subjects, but behind closed doors she's a sad and depressed woman who's in perpetual mourning over her dead "sister" Pink Diamond and wallowing in her own guilt over her failure to prevent her death.
** In "Can't Go Back", she tried educating Pink on this, instructing her to "smile and wave" to show her subjects that the Crystal Gem rebellion was really nothing to worry about. [[spoiler:This is what partially led to Pink rebelling in the first place]].
* WoobieDestroyerOfWorlds: When we see her in the present day, she is obsessed with her grief over Pink Diamond, trying to gain closure from looking for answers on how exactly her 'sister' died and who did it.
* YouAreBetterThanYouThinkYouAre: Her speech to Pink Diamond was probably intended to be this, as she encourages Pink to stand strong in the face of the rebellion and tells her that she ''can'' complete the colony she begged for. [[spoiler:Shame that what she mistook for being an UngratefulBastard was actually Pink having had a HeelRealization...]]
* YouHaveFailedMe: Responds to Ruby screwing up Sapphire's visions and fusing with her by ordering Ruby's gem broken.
* YouWillBeSpared: She takes Greg with her back to Homeworld to be preserved in the Human Zoo after he shows her compassion, believing she's saving him from being killed by the Cluster ([[DramaticIrony or so she thinks]]).
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!!Blue Diamond
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/blue_d_32.png]][[caption-width-right:250:[[labelnote:Click here to see her mural.]]https://static.tvtropes.org/pmwiki/pub/images/blue_diamond_mural.png[[/labelnote]]]]
->'''Voiced by:''' Lisa Hannigan\\\
''"You cannot fathom how much I've mourned, what thousands of years of grief has done to me!"''
The second Diamond mentioned and the first to appear in the series proper in "The Answer". She was at the Sky Arena during Rose's rebellion, and Sapphire used to report directly to her. She leads Homeworld's diplomatic Gems, and may be the blue Gem on the mural from "Serious Steven".
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* {{Adorkable}}: [[WhenSheSmiles When she's happy]] she tends to become this.
** In "Steven's Dream" she cheers up after she has a meaningful conversation with Greg during one of her secret visits to Pink's shattering site. The way she talks about how she shouldn't even be on Earth is similar to a teenager who snuck out of the house at night, something she doesn't want her "mother" and "older sister" to know about, and when she finally decides to [[ImTakingHerHomeWithMe take Greg back with her]] she has a downright goofy smile on her face, and doesn't notice she's [[AndCallHimGeorge holding Greg too tightly]].
** [[spoiler:In "Legs From Here to Homeworld", she looks just adorable when crying TearsOfJoy over Pink [[NotQuiteDead still being alive]] (in a sense) and nuzzling Steven against her cheek, but she again doesn't notice that she [[AndCallHimGeorge is squishing him just a bit]]. She also seems to become amused by Steven's curiosity around things he should know about as "Pink" and cracks a few smiles at Yellow's growing frustration over the entire thing.]]
** In "Familiar", [[spoiler:she's absolutely delighted to see Steven again because Pink always made her happy, and there is no change from the way Pink acted thousands of years ago to how Steven acts presently. The only difference she notes is calling "Pink" Steven now, which she precedes to say multiple times with emphasis on different syllables because she thinks it sounds funny.]]
** A promo for "Diamond Days" has her confused as to why [[spoiler:Garnet would... call herself a Garnet.]]
* AdultFear:
** Her grief for her "sister" Pink echoes what most parents fear — losing one's child, and the struggle to move on from it. Moreover, in "The Trial", while confronting "Rose" (actually Steven claiming to be her), she acts like an angry, grieving mother who wants justice for Pink's murderer.
** In "Reunited", when she finally gets the chance to avenge Pink's death, she's faced with the harsh truth: [[spoiler:Getting revenge won't make everything better. The Pink she knew is already gone, and pursuing further action would only make more people suffer]].
** [[spoiler:In "Legs From Here to Homeworld", she discovers that she and the other Diamonds launched their attack on Earth while Pink Diamond was on it.]]
* AffablyEvil: Is surprisingly friendly and cordial to Greg before kidnapping him for her Human Zoo, which she sees as an act of kindness to Greg due to her believing that the Cluster is still going to destroy the Earth. [[spoiler:She also ceases her hostility towards the Crystal Gems after finding out that Rose/Steven is Pink Diamond.]]
* AlienInvasion: [[spoiler:In "Reunited", she and Yellow show up to check up on the Cluster and and attempt to decimate the Crystal Gems. The fact Ruby and Sapphire were having their wedding was just a coincidence.]]
* {{Ambadassador}}: Word of God describes blue Gems as typically created with diplomatic skills and Blue has been established to be in charge of Homeworld’s court system. [[spoiler:"Reunited" shows that despite not being in charge of the military, she is a dangerous warrior by herself that requires absolute teamwork from the Crystal Gems just to bring her to a knee. In fact the episode showed that if motivated enough she’s willing to get her hands dirty, which she does to get vengeance against the Crystal Gems despite Yellow already trying to force the Cluster to emerge.]]
* AloofBigSister: Not as much as Yellow, but she is shown to be condescending and hard towards Pink in "Can't Go Back". "Now We're Only Falling Apart" even has her callously reject Pink's offer to [[spoiler:spare the Earth. Eventually, this is what made Pink believe that Blue never cared about her. A promo for "Diamond Days" has her angrily telling "Pink" to "quit fooling around".]]
* ArcVillain:
** She's the main antagonist of Ruby and Sapphire's love story.
** She sets the events of "[[RescueArc Out of This World]]" into motion when she "rescues" Greg, although she is never confronted and Holly Blue Agate is the one who directly opposes the Crystal Gems.
* AstonishinglyAppropriateAppearance: She has droopy, sorrowful eyes, is colored blue, and wears a long veil. She's in perpetual mourning.
* TheAtoner: [[spoiler:She wishes to make it up to Pink for ignoring her pleas to spare the Earth by preserving Pink's legacy.]]
* AxCrazy: Downplayed; while she's quite calm normally, her depression makes her very emotionally unstable when provoked-she is quite quick to [[HairTriggerTemper anger]] and DisproportionateRetribution. It's not yet clear if her violent anger was a result of losing Pink Diamond or not.
* BadBoss: Blue Diamond's response to Ruby accidentally averting Sapphire's prophecy (by saving her AKA the job she was assigned to) and for fusing together with her? [[DisproportionateRetribution Why, smash Ruby's gem of course!]]
* BarehandedBladeBlock: She stops a jumping sword attack from Connie with one hand, then effortlessly shatters Rose Quartz's sword.
* BecauseYouWereNiceToMe: It's implied that in-between dealing with {{Sycophantic Servant}}s, and Yellow Diamond's attempts to destroy everything related to Pink Diamond and [[QuitYourWhining seeing Blue Diamond's feelings as useless]], Blue Diamond didn't have the time or place to properly vent and grieve. Then comes [[NiceGuy Greg]], a mere human who not only takes the time to listen to Blue Diamond's thoughts, but tries to comfort her instead of dismissing her feelings or forcing her to move on. Blue Diamond takes such a liking to him that she decides to take him with her to the Zoo so he'd be spared the destruction of the Earth by the Cluster, [[DramaticIrony unaware it'd been neutralized by the Crystal Gems]].
* BeamSpam: Has the ability to manipulate energy, which includes making it rain energy beams.
* BenevolentBoss: She comes off as one in "The Trial", as she summons her palanquin for Defense Zircon to use for her argument when the latter requests her to, and later steps in on her behalf when Yellow poofs her.
* BerserkButton:
** ''Don't'' interfere with her attempts to get to the bottom of how Pink Diamond was shattered, even if you're Yellow Diamond. [[spoiler:Fortunately, her reaction to the truth is far more pleasant than one would expect.]]
** Rose's sword, given her reaction at the trial, [[spoiler:and once she actually sees it in "Reunited" she ''[[OOCIsSeriousBusiness stops]]'' crying and goes into an earth shaking rage before proceeding to break it like it was a toothpick.]]
* BewareTheNiceOnes: While outwardly more sympathetic than most Homeworld Gems, we're occasionally reminded that she's still very much not someone to be trifled with. In particular, she's so bent on revenge against Rose that she specifically wants to hear what Rose herself thinks her plan is, so she can do something ''worse''.
** Also, despite being meek and/or demure around Yellow Diamond, when [[spoiler:evidence starts cropping up that ''her fellow Diamonds'' might have been responsible for Pink Diamond's shattering]], she actually starts ''shouting.''
** Seen again in [[spoiler:"Reunited". She's a ''terrifyingly'' capable warrior, using her emotion-based powers to effortlessly incapacitate the entire Crystal Gem team. It was only Lapis Lazuli, whose [[DisabilityImmunity extremely tragic past made her immune to Blue's grief wave]], that allowed them to temporarily stun her. And even then, she was back up in seconds.]]
* BigBadDuumvirate: Often serves in this role with Yellow Diamond. [[spoiler:They even invade the Earth together.]]
* BigSisterBully: Not physically or intentionally, but her constant dismissal of Pink, [[spoiler:combined with her refusal to let Pink spare the Earth, led Pink to dislike Blue and believe she never cared about her. In present day she seems to have [[HeelRealization realized this]], as she [[ItsAllMyFault blames herself]] for Pink's "death" and seems to have come to the conclusion that Pink was right about humanity not deserving to die. A promo for "Diamond Days" has her angrily telling "Pink" to "quit fooling around".]]
* BigSisterInstinct: In a flashback, Blue at least tries to thoroughly praise and encourage Pink Diamond in light of the rebellion, a stark contrast to Yellow simply turning her back on the latter. It doesn't actually ''work'' [[spoiler:because she misunderstood Pink's motivation]] and comes off as CondescendingCompassion, but she gets points for trying, unlike Yellow, who was straight-out ignoring Pink. In "Familiar", Blue notes that she always loved Pink's cheerful personality.
* BitchInSheepsClothing: While not an unsympathetic character, Blue's role as the softer foil to Yellow can push her into this. Yellow's hostility is very visible and stated easily while Blue's isn't always evident but it's still there. Blue always comes across as the more empathetic of the two, but her CondescendingCompassion and infantilization of Pink strike at a deeper level than Yellow's bluntness. [[spoiler:It's especially apparent in scenes like when Steven meets her in the pool; Blue seems receptive at first but by the end of the conversation it's clear she doesn't "see" him as anything other than a facade Pink put on and when faced with Garnet she only acknowledges the Gems that make her rather than as her own person.]]
* BlessedWithSuck: Her sadness bomb is powerful, but since it works by imposing Blue Diamond's feelings on other gems, it's likely that it's only that strong because Blue lost a family member she was very close to and then was left to deal with her grief without any real sympathy for millennia, which left her so broken that only Lapis Lazuli can out-tragic backstory her, and even then Lapis shed a SingleTear. Yeah, it's good in a fight, but she would definitely be a happier Gem without it.
* BrokenBird: This may overlap with BreakTheHaughty; while it's unknown how "evil" she was before Pink Diamond's shattering, it's clear that it left her in a permanent state of depression in the present for millennia and she's not going to recover from anytime soon.
* ButForMeItWasTuesday: When Blue Diamond sees Sapphire and Ruby face to face, she doesn't even remember them as the Gems she was furious at centuries before, though this is understandable as the event in question was over five thousand years ago. [[spoiler:She remembers who they are in "Reunited" once she sees Garnet.]]
* TheChainsOfCommanding: If Yellow Diamond is telling the truth, Blue Diamond's deep and perpetual grief over the death of Pink Diamond may be causing her to neglect her duties as a leader of Homeworld.
-->'''Yellow Diamond:''' Where's their Diamond when they need her, Blue? ''You've got to be a leader, Blue!''
* CharacterDevelopment: While it's left up in the air how much of it is due to grief, her modern appearance suggests she has changed a ''lot'' since the Rebellion and Pink Diamond's death. [[spoiler:She's also far kinder and more considerate towards Steven than she was in flashbacks to Pink.]]
* CoolAunt: [[spoiler:After realizing Steven is technically Pink, she becomes far kinder, more supportive, and considerate towards him than she was to Pink. Where Yellow still has some harshness towards him, Blue is quick to come to his defense and instantly jumps in to try and help heal Centipeetle — when Yellow near instantly writes it off as a lost cause — because it's important to "Pink". "Familiar" briefly has her calling him "Steven" instead of "Pink".]]
* CostumeEvolution: The Moon base mural depicts Blue Diamond with a bare head and darker colored hair. When Blue Diamond appears in "The Answer" and "Steven's Dream", she wears a dark blue cowl and has bluish-white hair.
* CreateYourOwnHero: [[spoiler:If she hadn’t been so quick to turn against Ruby and Sapphire for fusing into Garnet, it probably would have never resulted in the Crystal Gems and made Pink try to make Earth a home for dissatisfied and outcast gems.]]
* CreepyShadowedUndereyes: She has heavy shadows under her eyes that are a darker shade of blue than the rest of her face, [[ExhaustedEyeBags ostensibly from grief]] over losing Pink Diamond. Note that, in the flashback in "Now We're Only Falling Apart" where we see her face, she ''didn't'' have these, only because Pink was still alive then.
* CripplingOverspecialization: Her EmotionBomb is so powerful that she seems to use it as a crutch in combat, to the point that she doesn't appear to know how to fight properly without it. It's telling that when [[spoiler:Lapis]] shrugs it off her only backup plan is to bombard her opponent with magic until they poof.
* CurseOfBabel: She was able to temporarily restore Nephrite's speech, implying that this part of the corruption was her doing.
* CurtainsMatchTheWindows: {{Downplayed}}. Her hair ''is'' blue, but quite light when in comparison to her eyes.
* DarkIsEvil: Well, more of an AntiVillain, really, but her overall dark color scheme and shadowed face match her occasional cruelty and indifference well enough.
* DarkIsNotEvil: [[spoiler: She becomes this after Steven reveals to her the truth of Pink Diamond’s whereabouts.]]
* DavidVersusGoliath: [[spoiler:What the fight between her and the Crystal Gems amounts to in "Reunited". Unfortunately for them, this Goliath is too damn hard to take down even with Lapis' help.]]
* DeathGlare: [[spoiler:Gives two to Steven in the "Wanted" arc.]] Before that she gave one to Sapphire in "That Will Be All".
-->'''Blue Diamond:''' [[spoiler:I want to know what SHE thinks we're going to do with her. ''Because I want to do something '''worse'''.'']]
** [[spoiler:Shows up again in "Reunited". As the Crystal Gems stand on the beach to fight her, she stares at them with murder in her eyes, and gives a big absolutely terrifying one to Connie when she attacks her with Rose's sword]].
* DeathSeeker: Or possibly doesn't care whether she dies or not. She sometimes visits Pink Diamond's grave on Earth even though, as far as she knows, the Cluster could become active at any moment.
* DisproportionateRetribution: She threatened to ''smash'' Ruby's gem, for fusing with a courtly Gem like Sapphire and "letting the rebels escape". This can be overlooked to some degree in that Rubies are ''literally'' RedShirts, and Ruby herself was confused over Sapphire's actions ''because'' Ruby knew she was expendable.
* DissonantSerenity: She's hardly fazed by Sapphire's announcement about an upcoming Rebellion attack, even when Sapphire details losses on Blue Diamond's side. Understandable in the fact that the Gems would've just been poofed, and Sapphire herself even says that she looks forward to seeing her again after she reforms.
* DotingParent: In a flashback on the Moon base in "Can't Go Back", she speaks to Pink Diamond about the latter's first colony in a stern, yet kind way. [[spoiler:That said, Pink Diamond didn't see her that way and believed she and the others never cared at all about her.]] After she learns that [[spoiler:Steven is Pink Diamond reincarnated, the first thing she's shown doing in "Reunited" is crying tears of joy while nuzzling Steven. Later on, Blue is quick to support his decision to try to uncorrupt Centipeetle and is willing to go to Homeworld to talk to White Diamond despite her fear of White.]]
* DramaticallyMissingThePoint: The Human Zoo that was kept in Pink's name? [[spoiler:That was created by Blue, because she misunderstood Pink's desire to preserve Earth]]. And she genuinely thought that [[spoiler:her and Yellow's decision to make Pink a puppet ruler of Earth would help shield her sister from the more difficult aspects of ruling, since she interpreted Pink's excuses as her having a hard time with colonizing Earth. It all backfired ''spectacularly'']].
* TheDreaded: Unlike Yellow's, Blue's entire court is even more visibly terrified of their own Diamond. In "That Will Be All", Blue Diamond struck such fear in her former subject Sapphire that the latter literally started [[BowelBreakingBricks freezing up]], and had to be placated by Ruby holding her hand in secret. "Steven's Dream" shows that even ''[[TheStoic Garnet]]'' is terrified of her.
* DueToTheDead: She secretly visits Earth to pay respects to Pink Diamond's "shattering" site behind Yellow Diamond's back, and knowing she'll disapprove. She also keeps a ShrineToTheFallen by bubbling Pink's Rose Quartzes and preserving her old Human Zoo and bed chambers. Yellow Diamond's efforts to {{Unperson}} Pink and destroy everything related to her, on the other hand, is at their core, someone desecrating a loved one's grave and memory for the sake of repressing her own pain and grief.
* TheEeyore: Ever since Pink Diamond's shattering, she's been depressed and sad all the time — so much that [[TheChainsOfCommanding she began neglecting her leadership duties]].
* EmotionBomb: She has the ability to project her own emotions onto other Gems, and it's potent enough to make every Gem within the area start crying at once and even fall to their knees.
** [[spoiler:We see the full, horrifying extent of this in "Reunited". In earlier episodes, her projection power seemed like something she couldn't control — it only popped up when she felt strong emotion. Then we see that she not only has complete control over it, she knows how to weaponize it. With a single raise of her hand, she takes out the ''whole Crystal Gem team.'' (Barring Connie and Lion, who, as a human and lion, aren't affected at all.)]]
* EvenEvilHasLovedOnes: It's unclear how high she ranks on the 'evil' scale in the present day, but she really seems to care about Yellow and Pink, comforting the former in "That Will Be All" and "The Trial" and having mourned the latter's [[spoiler:supposed]] death for ''five thousand years''.
* EvenEvilHasStandards:
** In contrast to Yellow Diamond, who views organic life as something to be snuffed out, Blue Diamond takes [[CondescendingCompassion a more paternalistic approach]] by keeping humans in a nature preserve in Pink Diamond's memory.
** Despite demanding deference and respect from her subjects, even she doesn't seem to care for displays of excessive brown-nosing, albeit not to the same obvious extent as Yellow.
** During "The Trial", she's very insistent on taking the proceedings seriously (as opposed to Yellow Diamond, who openly treats it as a [[KangarooCourt show trial]]).
* ExcessiveMourning: Pink Diamond died over five thousand years ago. Blue Diamond still mourns her death as though it had happened yesterday. {{Justified|Trope}}, as she's lived for possibly ''eons'', and five thousand years really ''is'' like yesterday for her.
* ExoticEyeDesigns: Like Yellow Diamond, she has diamond-shaped pupils.
* ExpositoryHairstyleChange: While Blue Diamond's pre-Rebellion-era mural depicts her as having flowing blue-black hair, her hair in the present day is shorter and stark white. Blue Diamond's hair likely changed for one of the reasons (besides age) a human's hair might turn white: stress due to her long mourning and grief.
** Then again, Blue is shown in a flashback before Pink's death and has white hair even then, though there aren't bags under her eyes. It's more likely that the mural shows an abstracted version of her dark hood.
* FatalFlaw: Sloth. If Yellow Diamond's song is anything to go by, Blue Diamond is so overwhelmed with grief that she is living in the past and neglecting her duties as a leader.
** This seems to be a subversion after "The Trial", where Blue isn't just grieving, she's unable to accept the official story of her beloved sibling's demise — ''because it makes no sense''. The questions "How could Rose do it?" and "How ''did'' Rose do it?" are tearing her up inside. This, coupled with the fact that Yellow is uninterested in finding the truth, is causing her even more distress. A real-world equivalent would be a grieving person whose sister was murdered [[NeverFoundTheBody but they never located their family member's dead body]]. Little wonder Blue is unable to move on.
* FauxAffablyEvil: She talks in an almost soothing manner, but is also indifferent to her followers at best. Downplayed in the present; she is quite capable of kindness (albeit in the CondescendingCompassion sense), but still hardens when she gets suspicious.
** [[spoiler:It's far more this than AffablyEvil in the past, when Pink tries to convince Blue and Yellow to spare the Earth, where '''Blue''' is the one to talk her down and shut her up. Though she's still noticeably more light than Yellow, whose back is turned from Pink and has absolutely '''nothing''' to say to her sisters.]]
* FiveStagesOfGrief: In the modern day, she's very clearly in the Depression stage and has been for quite some time. It's unclear if her actions during the Rebellion were influenced by the Anger stage though. To a lesser extent, she's also stuck at Bargaining, as she hoards anything and everything that belonged to Pink Diamond. It's a major reason she brought Greg (a native to Pink's "home planet" Earth) to the Zoo, as well as why she keeps all of Pink's Rose Quartzes bubbled instead of shattering them.
* {{Foil}}: To her "sister", Yellow Diamond. Aside from their colors and masculine/feminine personalities, Blue Diamond constantly and obsessively mourns Pink Diamond, collecting everything related to her to preserve Pink's memory, and is so utterly consumed by her own depression that she neglects her duties as ruler of Homeworld.
* FoolishSiblingResponsibleSibling:
** Yellow and Blue (responsible) and Pink (foolish). [[spoiler:After Pink's HeelFaceTurn, the roles are reversed.]]
** This trope is ZigZagged between her and Yellow in the present day during Steven's trial. While Blue does act like a depressed {{NEET}}, at the very least she's insistent on continuing the trial properly. Yellow, on the other hand, while she's determined to keep her forces in line, she treats the trial like a KangarooCourt.
* ForeheadOfDoom: She has a very tall forehead which adds to her perpetually droopy face.
* ForYourOwnGood: When Pink was reluctant to continue with the Earth colony, she and Yellow directly intervened. She was quite vocal about it, wanting her younger sibling to be as successful as them.
* FragileFlower: Blue Diamond is quite emotionally unstable, unintentionally harmful to those she loves (mainly Yellow Diamond), and extremely self-observed. Grieving certainly only highlighted these features in her, and at this point, the only Gem who could've opened her eyes to it (Yellow) doesn't do so because she's afraid of breaking Blue even further.
* FrickinLaserBeams: Her primary attack in [[Recap/StevenUniverseS5E23Reunited "Reunited"]] is to [[StatusAilment slow down the Crystal Gems]] with {{Emotion Bomb}}s and summoning self-directing {{Hand Blast}}s to barrage the battlefield.
* {{Gasp}}: Blue Diamond reacts this way after Blue Zircon implies [[spoiler:one of the Diamonds shattered Pink]], either for the shock of such sacrilegious declaration, or because it actually ''makes sense'' (Blue Diamond trying to calm Yellow Diamond makes the latter a likely situation). [[spoiler:She also gives one of these in "Reunited", when she realizes that Steven really ''is'' the supposedly-shattered Pink Diamond.]]
* GodSaveUsFromTheQueen: Very queenly (Greg even calls her "Your Highness"), and also very tyrannical. Does not hesitate to order Ruby executed for breaking a taboo, even accidentally while trying to do her job. She may have lightened up in the present day, though how much remains to be seen.
* HairTriggerTemper: Ironically, Blue Diamond's temper can be even ''worse'' than Yellow Diamond's. It took one of her followers calling her what is probably the equivalent of a Gem slur, and in another case, being accused of murdering her own sister, for Yellow to finally snap and get violent. Blue, on the other hand, was immediately ready to shatter one of her own Gems for accidentally fusing with one of her elites, and totally lost her composure because "Rose Quartz" apparently didn't want to remember the most traumatic event in her life. As mentioned above in AxCrazy, it's unclear if her violent anger is as a result of Pink Diamond's [[spoiler:supposed]] shattering. "Now We're Only Falling Apart" implies that she was like this beforehand considering how [[spoiler:Pink Diamond express fear and guilt for leaving Garnet at her mercy and makes her change her goal from scaring Homeworld off of Earth to making it a home for outcast gems]].
* HartmanHips: She has curvy hips that are most noticeably prominent in "Reunited".
* HeartIsAnAwesomePower: A dark example. Yellow has [[ShockAndAwe electricity-based powers]] which can effortlessly "poof" a Gem, taking them out of commission. Compared to this, Blue's EmotionBomb gift of spreading her feelings to other Gems seems weak... [[spoiler:Then "Reunited" aired, and we see that she can easily weaponize that reverse empathy to completely incapacitate ''every Gem in range.'' Her power is so strong that it unfuses Alexandrite within seconds.]]
* HeavenlyBlue: She is, as her name implies, blue, resembles the Virgin Mary, has blue light attacks and is worshipped as a god. [[LightIsNotGood She is however an antagonist.]] [[spoiler: For most of the series, anyway.]]
* HeelRealization:
** [[DownplayedTrope Has had a partial one]]. Unlike Yellow, she's realized humanity doesn't ''deserve'' to die and has come to respect them. However, she's unable, or unwilling, to go against Yellow and do more than spare a few of them.
** [[spoiler:Unlike Yellow, she seems to have realized she and Yellow were too [[BigSisterBully callous and cruel]] to Pink, to the point of [[ItsAllMyFault blaming herself for her apparent demise]]. When she realized Steven is Pink (in a sense), she stops her rampage and shows she really ''has'' changed, being far kinder and more considerate to him and what he wants.]]
* HiddenEyes: Seems to be a theme with her, as her Pearl, Sapphire, and Blue Diamond herself all cover their eyes.
* HiddenDepths:
** [[spoiler:"Now We're Only Falling Apart" reveals Blue created the human zoo as an attempt to compromise with Pink Diamond’s begging to cease the colonizing of the Earth. Very surprising considering she was as dismissive of organics like Yellow Diamond yet she was able to make sure future generations of Zoomans wouldn’t understand feelings like sadness and pain.]]
** A darker example in "Reunited". [[spoiler:Previously, she had raised her voice on the show twice, both in "That Will Be All" and "The Trial," and she seems almost weak compared to the war-like Yellow. Then we see her battling in action, and... let's just say it's not pretty.]]
*** The same episode demonstrates that she understands just how useless continuing the war with the Crystal Gems is, since no matter how much they suffer it can't bring Pink Diamond back.
* {{Hypocrite}}: In a flashback in "Now We're Only Falling Apart", Pink Diamond is shown to be worried that Blue will scold her for visiting the [[spoiler:Prime Kindergarten]], but in "Steven's Dream", Blue herself is shown going against Yellow's orders and visiting the Earth against her wishes.
* IcyBlueEyes: She has droopy, light blue eyes, which can appear [[InnocentBlueEyes innocent]] when she grieves.
* ImplacableMan: In "[[Recap/StevenUniverseS5E23Reunited Reunited]]", even with the combined efforts of [[spoiler:the Crystal Gems (including Connie, Bismuth, Peridot and Lapis, who has the ''entire ocean'' as her weapon) [[BossRush all attacking Blue Diamond at once]], all they manage to do is slow her down and knock her off her feet, Blue Diamond easily breaking any hold they have on her and [[NighInvulnerable shrugging off every attack]], including Lapis dropping the barn on her and the Cluster ''slamming Yellow's ship onto her ship ONTO HER!'' And that was ''before'' Yellow Diamond joins in...]]
* INeverSaidItWasPoison: Subverted, as she's definitely not [[spoiler:the murderer of her beloved Pink Diamond. She does, however, correct Steven, who had become convinced his mother eventually used Bismuth's [[HeWhoFightsMonsters Breaking Point weapon]] to kill her own Diamond. Blue screamed it was a sword. Bismuth designed Rose's sword to slice through physical forms, but ''never'' shatter the gem itself.]]
* InTheHood: She wears a long blue cloak that does a good job of [[HiddenEyes obscuring her eyes]]. It gives her a likeness to the Virgin Mary when she stands.
* IronicName: Blue diamonds represent peace, spirituality, and good health, which is ironic, given that her lasting grief and mourning over Pink is ''far'' from an improvement to her well-being.
* ItsAllAboutMe: Grieving has made Blue increasingly self-centered, causing her to push away her responsibilities to the Gems who follow her and reject Yellow's attempts to help her. Yet this selfishness comes with minimal self-reflection, as it's clear she's putting the burden of Pink's demise on everyone but herself.
* ItsAllMyFault: She blames herself for not preventing Pink Diamond's shattering at the hands of Rose, a sentiment that she privately expresses to Pink Diamond's ruined palanquin while visiting Earth in "Steven's Dream". "Can't Go Back" reveals she pressured Pink Diamond into continuing the war for Earth [[spoiler:even though Pink wanted to just leave Earth and the Crystal Gems alone]], explaining why she feels that way.
* KickTheDog: Has a bad habit of this, but not to the same extent as Yellow Diamond.
** In Ruby and Sapphire's love story, she threatens to have Ruby shattered for something that was an obvious accident.
** She treats both Holly Blue and Sapphire with utter ''disdain'' when they interrupt her chat with Yellow Diamond.
* KickTheMoralityPet: She and Yellow Diamond perform a dual one in a flashback in "Now We're Only Falling Apart", in which they reject Pink's offer to [[spoiler:spare the Earth]].
* KnowWhenToFoldEm: In "The Answer", she knows her limits and tries to escape the rebels on her palanquin.
* LadyOfBlackMagic: Her regal robes and hood invoke a resemblance to a classical witch, and she primarily uses magic in combat either in the form of her [[EmotionBomb depressive aura]] or [[BeamSpam energy blasts]].
* LargeAndInCharge: She's only slightly shorter than Yellow, as seen when the two stand side by side in the fourth and fifth seasons. The height difference is probably because Yellow wears heels.
* LaserGuidedKarma: [[spoiler:She gets hit by this ''hard''. Since she was such a BadBoss towards her subjects and was so [[AloofBigSister condescending]] to Pink, the latter ends up [[FakingTheDead faking her death]], which makes her cross the DespairEventHorizon and mourn Pink's "death" for ''millennia''.]]
* LeanAndMean: In her initial appearance, she is veiled, ambiguously threatening with long, lean arms, and is perfectly willing to crush Ruby's gem more for accidentally fusing with Sapphire than allowing the rebels to escape. In the present, this is {{subverted|Trope}} as she is more traditionally feminine-looking than her 'sister' Yellow Diamond with a fuller, more hourglass shape. Whether this is due to Garnet being an UnreliableNarrator in "The Answer" or due to a regeneration in the intervening millennia is yet to be known.
* {{Leitmotif}}: Her specific variation of the Diamonds' theme, heard during her meeting with Greg, incorporates a twinkling chiptune not dissimilar to Lapis' celesta.
* LightEmUp: In her battle with the Crystal Gems she throws beams of blue devil light.
* ALighterShadeOfBlack: As opposed to wanting to destroy Earth for the sake of {{Revenge}} (like Yellow Diamond), Blue Diamond wishes Earth wouldn't die (as it's one of the last remnants of Pink Diamond). In fact, she and the human Greg have a moment based around both losing loved ones. She still basically kidnapped him, but it was for more sympathetic reasons than spite. This is on top of her developing a respect for humanity for persevering through life despite, in her eyes, being weak. [[spoiler:Her actions in "The Trial" only lighten her further, as she's a ReasonableAuthorityFigure compared to Yellow, adamantly refusing to cut straight to an execution without going through due process, and giving Steven and his defense lawyer adequate time to speak and defend themselves, even allowing Blue Zircon to present her personal Diamond palanquin as evidence. While she doesn't stop Yellow from poofing both Zircons, she IS furious that Yellow did so in the first place and lets her know it.]]
* LightIsNotGood: Her palanquin, hooded veil and flowing robes offset give her an eerily saintlike appearance. As the rest of these tropes will tell you, she's anything but — or, at least, she was back during the Rebellion. As the ALighterShadeOfBlack entry explains, she's certainly a little better than Yellow Diamond these days.
* LockedOutOfTheLoop: As "The Trial" reveals, she's (almost) completely in the dark about what really happened with Pink Diamond's death.
* LongHairIsFeminine: The Moon base mural depicts her with long black hair, and in the present day her hair is long, flowing, and pale with a "loop" that wraps around her gem.
* MamaBear: It's heavily implied that she and Pink Diamond were very close, and her shattering affected her greatly. Her behavior in "The Trial" is akin to an angry, grieving parent searching for answers and confronting the (supposed) killer of their child on why they did it. [[spoiler:In "Reunited", she takes a personal fight to the Crystal Gems, and very nearly defeats them in a matter of seconds, all because she despises the fact they're sullying Pink's former planet with their presence.]]
* MeaningfulName:
** The Hope Diamond, the world's most famous diamond, is a blue diamond. Blue Diamond seems to be the direct leader of the nobility. The Hope Diamond is also believed to be cursed and bring misfortune to anyone who tries to wear it, which is fitting given Blue Diamond being ''very'' quick to shatter Ruby, and the fact Lapis (who wears Blue Diamond's symbol) has been hit with the most misfortune of ''any'' other being, Gem or human. Blue Diamond herself also suffered the loss of a loved one and has spent much time in constant mourning and heartache. She also has the ability to inflict sadness and sorrow on others.
** When we finally see her again, she's in mourning, and is implied to have been so for the past few ''thousand'' years. Yellow Diamond's VillainSong "What's the Use of Feeling (Blue)?" mixes it with PunnyName; it's like being called "Sad Diamond".
* MoodSwinger:
** She suddenly snaps out of mourning when she's suspicious of Sapphire's (false) claim to have been on a special mission for her. Then Sapphire explains she was taking an opportunity before Earth was destroyed, and Blue Diamond instantly snaps ''back'' to looking miserable.
** In "The Trial" she starts out calm but when she questions "Rose" who lies to her about how Pink was shattered, Blue is enraged for a second before grief and frustration overwhelm her, and she breaks down for a moment.
* MoralMyopia: Blue Diamond had no moral qualms about ordering Ruby's execution, suggesting that she has a harsh standard for Gems that disobey her rules. However, when her sister Pink Diamond was [[spoiler:apparently]] killed, she mourned for ''centuries''. Somewhat justified from the Diamonds' point of view, considering the caste system — Rubies are meant to be expendable soldiers. It doesn't make it any less monstrous, mind you.
* MyGreatestFailure: She and Yellow were tired of Pink's excuses in not completing the Earth colony, reassuring her Rose could do nothing against her, and instructing her to quash the rebellion. Shortly afterwards, news reached her that [[MyGodWhatHaveIdone Pink was shattered by Rose]]. [[spoiler:Her current behavior implies she is also aware her own callousness towards Pink may have contributed to what happened and regrets it.]]
* MysticalWhiteHair: Has long white hair. Her mural, however, depicted her with black hair.
* {{NEET}}: PlayedForDrama; while she is one of distinguished Gems that command everything on Homeworld and other Gem-controlled planets, Blue nowadays does nothing but wallow in her own grief, something Yellow Diamond calls her out on.
* NeverMyFault: In "The Answer", she blames Ruby for not stopping Rose and Pearl when Sapphire predicted it, even though she never did a thing to stop them herself.
* NiceGirl: Is usually kind and friendlier than Yellow Diamond [[BewareTheNiceOnes unless provoked.]] Played straight after [[spoiler: learning the truth about Pink Diamond’s whereabouts. She isn't even hostile towards ''Garnet''.]]
* NiceMeanAndInBetween: [[spoiler:Yellow (mean) is a [[HairTriggerTemper short-tempered]] BadBoss, Blue (in-between), while initially as bad as Yellow, seems to have TookALevelInKindness in recent years thanks to Pink Diamond's "death", and Pink (nice) is an AllLovingHero and a BenevolentBoss who cherishes and wishes to protect organic life.]]
* NighInvulnerability: On par with Yellow Diamond. [[spoiler:She endured having a barn dropped on her, being attacked by all of the Crystal Gems, and being crushed by her own ship! When she gets back up, the only visible damage is her hair being slightly displaced.]]
* NobleDemon: She wants to save at least some humans to honor Pink's memory, and she's an impartial and fair judge (of Steven, who we must remind you ''she thinks murdered Pink'').
* NonStandardCharacterDesign: Her appearance borrows heavily from the style of Creator/LeijiMatsumoto to give her "[[https://twitter.com/cartoonnetwork/status/826230013519360000 a strange presence]]".
* NotSoDifferent:
** Greg saw Blue Diamond's loss of Pink Diamond as no different than his loss of Rose. Their experiences with the death of a loved one allowed both of them to bond; what's more, Blue kneels down to look at Greg at eye-level more or less as this happens, which is in its own way acknowledging this trope.
** She's also this to Pearl (at the beginning of the series): both are trying to cope with the death of their loved one in the same way, by constantly grieving and refusing to move on. [[spoiler:Ironically, Greg's, Pearl's and Blue Diamond's loved ones are all the same individual]].
** To Amethyst (post-Gem War). Both are considered the lazy, undisciplined members of their team, lacking proper motivation to work with others due to unresolved emotional growth (Amethyst's inferiority complex being an Earth-born gem and defective, Blue Diamond believing Pink Diamond had died in what may have been a preventable tragedy) and have developed counter-dependent attitudes towards anyone that pushes them over it (Pearl/Yellow).
* OhCrap: Twice in "From Legs to Homeworld". [[spoiler:Once she learns of what the Diamonds' combined attack had ''actually'' done to all the Gems on Earth, she reacts in disbelief and horror. She's also ''terrified'' of incurring White's wrath over the senseless destruction she and the other Diamonds had caused because they all couldn't agree on Earth's colonization, behaving like a child who just realized they had utterly screwed up in a huge way]].
* OnlySaneMan: Blue is determined to find out the truth behind Pink Diamond's demise through court, whereas Yellow is adamant Rose was responsible, going increasingly off the rails and suspiciously [[RevealingCoverup trying to shut down any line of inquiry]].
* OohMeAccentsSlipping: Occasionally betrays hints of an Irish accent. From "Can't Go Back" onward, [[VocalEvolution she speaks entirely with one]].
* ParentalSubstitute: One possible interpretation of her relationship with Pink Diamond, considering that Pink is implied to have been the youngest of the Diamonds and someone had to teach Pink how to behave like a Diamond. [[OutlivingOnesOffspring This makes Blue Diamond's grieving even more tragic]].
* PartingWordsRegret: Implied. The flashback in "Can't Go Back" is implied to be the last conversation she had with Pink before the latter's [[spoiler:faked]] assassination. What she says to her pretty much reads as "stop whining and be a good little PuppetQueen", and she encourages Pink to dismiss Rose Quartz as a threat. No wonder she's so broken up about Pink's passing. In particular, her final sentence was ''"[[TemptingFate As long as you are there to rule]], this colony will be completed."'' [[spoiler:Ironically, Pink Diamond ''didn't'' want the colony to be completed, and took Blue Diamond's words to mean that the only way that Earth could survive was if she removed herself from the equation.]]
* PerpetualFrowner: Her eyes are constantly drooped, and she's barely ever seen not crying.
* PetTheDog: Since she seems to be nicer than Yellow Diamond, she has quite a few.
** Even during the Rebellion, Blue Diamond is shown to have a respect for high-ranking members of her court, as she thanks Sapphire for her vision.
** She is perhaps the first Homeworld Gem to quickly realize that humans are capable of empathy and feeling loss, and she lifts her veil and ''lowers herself to Greg's eye level'' to speak with him as an equal. Her abduction of Greg is because she thinks he doesn't deserve to die; at the time she did not know the Cluster was no longer going to destroy the Earth.
** Her desire to preserve Pink Diamond's legacy includes keeping the humans in the Zoo well cared for and keeping the Earth Quartzes and other Rose Quartzes alive (even if the latter are bubbled), both of which Yellow Diamond finds absurd. She also [[DramaticIrony intended]] [[YouWillBeSpared to save Greg]] by kidnapping him and taking him to the Zoo.
** She keeps the trial going, wanting to hear Steven and his defense Zircon out, and won't execute Steven outright when he demands to be punished for Rose's crimes.
** When Yellow Diamond starts going ballistic on the Zircons [[spoiler:when the Defense one implies that the Diamonds shattered Pink]], Blue steps in on their behalf.
** In spite of harshly scolding Pink Diamond for her supposed ungratefulness in a flashback in "Can't Go Back", she comforts her after seeing that her tone has upset Pink. [[spoiler:Unfortunately, Pink didn't see this as a Pet the Dog moment, instead as a KickTheDog moment.]]
** Despite taking a no-nonsense approach while facing the Crystal Gems, she ceases her hostility after she finds out that [[spoiler:Rose/Steven is Pink Diamond.]]
** She does genuinely care when she [[spoiler:attempts to restore Nephrite]].
* ReasonableAuthorityFigure: Well, when compared to [[AxeCrazy Yellow Diamond]] today, though she was just as bad around Ruby and Sapphire's time. [[spoiler:In "The Trial", she opts to go through "Rose Quartz's" (actually Steven) trial and hear out the defendant rather than going through with Yellow Diamond's wish of a quick execution. When Yellow Diamond goes ballistic from being accused of regicide, Blue Diamond tries to get her to calm down.]]
* PowerIncontinence: Blue's EmotionBomb powers cause any Gems around her to cry her tears, but she can't seem to turn it off. If she has even so much as tears of joy, any Gems around her will be left in various stages between weeping and uncontrollably bawling. This even extends to Pink and Yellow Diamond, to the latter's annoyance.
* RedOniBlueOni:
** Like their respective Pearls, Blue is the... blue to Yellow's red.
** Both she and Yellow serve as the blue to Pink's red, as they are more serious and less exitable than she is.
* RevengeBeforeReason: Subverted. We're led to believe that she wants to avenge Pink in the "Trial", given she wants to do ''something'' terrible to Rose. It turns out, however, that Blue wants answers more than revenge: how did her sister die, and ''why'' is the official story full of holes?
* {{Sadist}}: During "The Trial", Yellow wants to kill Steven in a quick and probably painless way, while Blue implies she wants to torture him. Also, in "Reunited", [[spoiler:when Steven enter the Diamonds's minds, Yellow is only thinking about Pink, while Blue is thinking about how much she wants the Crystal Gems to suffer, and that's not enough to make her feel better.]]
* ScrewThisImOuttaHere: In "The Answer", she flees in her palanquin when Rose and Pearl show up, rather than confront them directly.
* SelfServingMemory: She tells Greg that she and Pink Diamond were "very close", [[spoiler:yet Blue's constant dismissal of Pink, combined with her refusal to let Pink spare the Earth, suggests that their relationship was strained ''at best''. In fact, the only on-screen interactions between Blue and Pink when the latter was still alive have been fairly negative. "Now We're Only Falling Apart" even has Pink, as Rose, regretting leaving Garnet with Blue, implying that she sees Blue as more of a tyrant than a sister. It apparently got so bad that even thousands of years after faking her death, Pink didn't miss Blue at all.]]
* ShadowArchetype: To Lapis and Sapphire, who were both once part of her court.
** Blue, like Sapphire, was close to a red gem (Pink, Ruby), though Blue and Pink are implied to not have been as close as Blue thought. [[spoiler:Unlike Sapphire, who had friends make her see her mistakes, Blue let her position's expectations and her own arrogance influence her relationship with Pink, which both alienated her and drove her away to the point of rebelling in the form of the commander of an intergalactic war. By the time Blue realized her mistake, Pink has faked her death, and Blue wasn't the same since]].
** Blue, like Lapis, endured an equal amount of psychological trauma, which continued to affect them for thousands of years. [[spoiler:Unlike Lapis, Blue hasn't made an effort to try move on from Pink's death, something that Yellow Diamond called her out on in "That Will Be All".]]
* ShoutOut: Her character design is a nod to many of the willowy female characters from Creator/LeijiMatsumoto's works.
* SilkHidingSteel: Most of the time, Blue Diamond is a graceful and demure presence, and seems to defer to Yellow Diamond's more authoritative presence. However, it's hinted that she's got a firmer side to her, as seen by her quiet suspicion of Sapphire's presence in the Zoo at first. [[spoiler:Then, in "The Trial", we see her suddenly standing up to Yellow and engaging her in a ''shouting match''. And in "Reunited", the steel comes fully out as even when her "reverse empathy" power is stopped, she's ''still'' an incredibly powerful warrior who can summon weaponized beams of light and shrug off her own ship slamming into her like it's nothing.]]
* SoftSpokenSadist: [[spoiler: Has shades of this. Yellow's electric energy attacks "poof" Gems instantly, but Blue's ability--forcing any Gem to become overwhelmed with grief and suffering — keeps them fully conscious and aware of every second of the pain. When she uses that very power to incapacitate the Crystal Gems in "Reunited", she softly but intensely says one line: "''You deserve this.''" Ultimately subverted, however, as when Steven sees into her mind, she admits it doesn't make her feel any better at all. If anything it makes her feel ''worse''.]]
* SomeoneToRememberHimBy: A non-child example. Not knowing that the Cluster isn't going to destroy Earth, she kidnaps Greg as a memento of Pink Diamond.
* SouthPaw: Blue nearly always uses her left hand, and her ship is even a left arm.
* StatusAilment: Her {{Emotion Bomb}}s act as this in a battle situation, overwhelming every gem on the beach with overwhelming sadness and defusing Alexandrite in [[Recap/StevenUniverseS5E23Reunited "Reunited"]].
* SuddenlyShouting: "IT WAS A ''SWORD''!" It also applies to when Yellow Diamond starts poofing the Zircons — cue the soft-spoken Blue suddenly jumping forward to grab Yellow and shouting at her to get a hold of herself, and when [[spoiler:she comes face-to-face with Rose's sword in "Reunited"]].
* TaremeEyes: Blue Diamond has large, sad, downward-slanting eyes which fits with [[AstonishinglyAppropriateAppearance her perpetual mourning]].
* TearsOfJoy: [[spoiler:She cries these in "Legs From Here to Homeworld" over sheer joy at seeing Pink (as Steven) again.]]
* ThisCannotBe: [[spoiler:A rare not-entirely-evil example. At the end of "Reunited", Steven finally manages to send a psychic message that he has Pink Diamond's Gem. Blue's response? A soft "Impossible..."]]
** [[spoiler: Also in the same episode was surprise that Lapis Lazuli appears out of nowhere and declared herself a Crystal gem but also that she had resisted her emotion powers suggesting this has never happened before or that it's a rare event.]]
* ThisIsUnforgivable:
** Her reaction to Ruby accidentally fusing with Sapphire is threatening to shatter Ruby's gem in "The Answer".
** In "Reunited", [[spoiler:she tries to murder all of the Crystal Gems for daring to thrive on the planet that belongs to Pink]].
* TokenGoodTeammate: [[DownplayedTrope At least of the remaining three Diamonds]], [[spoiler:given what Pink was]]. Now that we've been introduced to both [[HairTriggerTemper Yellow]] and [[AbusiveParents White Diamond]], Blue seems to stand out as being nicer and being more down-to-earth than them.
* TooImportantToWalk: She's a member of the Great Diamond Authority and travels by palanquin.
* TomboyAndGirlyGirl: The Girly Girl to Yellow Diamond's Tomboy, taking note of their respective feminine and masculine personalities.
* TookALevelInCheerfulness: [[spoiler:She cries TearsOfJoy in "Legs From Here to Homeworld" over sheer joy at having "Pink" back.]]
* TookALevelInJerkass: [[spoiler:To an extent in "Reunited", though it's understandable given her circumstances at the time. She goes to Earth to make the Crystal Gems suffer and takes a no-nonsense approach when facing them.]]
* TookALevelInKindness: She is noticeably nicer and more mature in the present day compared to her extremely callous behavior towards Ruby and Sapphire for accidentally fusing in "The Answer" and her attitude in "Can't Go Back", as she bubbled and protected all the Rose Quartzes from being shattered by Yellow Diamond, and allowed the other Quartzes such as the Amethysts to still be in service [[FantasticRacism regardless of what Homeworld thought of them]]. [[spoiler:Realizing her callousness towards Pink may have contributed to her apparent death may have contributed to this.]]
* TragicKeepsake: Blue Diamond sees anything related to her dead "sister" Pink Diamond as something to preserve and keep around her. She keeps everything from Pink Diamond's empty throne room and the bubbled gems of her former Rose Quartz servants, to the Human Zoo and the Quartzes from the Earth Kindergardens. When Greg, a human from Earth, shows her compassion, Blue Diamond decides to take him, too, in order to save what she believes to be "one last piece of [Pink Diamond's] legacy" from the Cluster. Yellow Diamond derides Blue Diamond's habit of collecting anything related to Pink Diamond as useless clinging to the past. In "Reunited", [[spoiler:when she sees the surviving Crystal Gems and "Rose Quartz" still living on Earth, she is ''furious'', seeing it as a grave affront to Pink's memory]].
* TranquilFury: Like her former subject, Sapphire, she usually keeps her composure even when angry, only displaying cold irritation. It is during the events of "The Trial" that she [[EmotionBomb explodes]], even ''yelling'' at Yellow Diamond [[spoiler:when she goes on a rampage after being accused of killing Pink Diamond]]. [[spoiler:In "Reunited", she remains remarkably soft-spoken even during a pitched battle against the Crystal Gems, despite her words making it clear she feels nothing but anger at their presence.]]
* TrueBlueFemininity: She's a ''blue'' Diamond, after all. This seems to be a theme of her and her court since every Gem shown connected to her so far has been blue. In "Steven's Dream", she wears a simple shoulderless, figure-hugging gown underneath a cloak, reminiscent of old English mourning dress. This in direct contrast to Yellow Diamond's more masculine military jumpsuit.
* TheUnFavourite: Unlike Yellow who holds some resentment, Blue speaks no ill of White, yet did mention to Steven in ''Familiar'' that her attempts to emulate Pink's games and [[BigFun sense of humor]] by simply calling a group of Pyrites "Fool's Gold", backfired and enraged White Diamond.
* TheUnfettered: Back during the Rebellion, she didn't care about the losses that would be on her side. All that mattered to her was that the Gem Rebellion would be over, and Rose and Pearl captured and punished for their actions. In the present, she's actually the more rational between herself and [[RevengeBeforeReason Yellow Diamond]].
* UnskilledButStrong: She's as horrendously powerful as her rank suggests, and shrugs off a ridiculous amount of punishment. [[spoiler:It must be noted however that she ''takes'' a ridiculous amount of punishment in the episode "Reunited", as she barely moves, her melee defense is rudimentary at best, she fails to land decisive hits and lacks any sort of plan to counter Steven's shield. She even has to pause to weep into her hands before her depressive aura can be sent out for the first time. Yellow by comparison turns the fight around in moments, demonstrating that she knows how to properly leverage her advantages. [[JustifiedTrope Justified]] since she is primarily a diplomat, unlike Yellow who is responsible for the military and Pink who fought in the rebellion. Also, it's entirely possible that she has never fought an enemy who could shrug off her EmotionBomb ''and'' shield against her magic projectiles.]]
* UnwittingInstigatorOfDoom: [[spoiler:Tells Pink Diamond that "As long as you are there to rule, this colony will be completed." Unfortunately, Pink ''didn't'' want the colony to be completed, and this is almost certainly what led to her faking her death, and all the disastrous events that brought with it.]]
* UnwittingPawn: [[spoiler:She's unaware Pink has been playing her and Yellow like a fiddle ever since she grew to love the Earth. It gets a bit sad when you remember she genuinely loves Pink.]]
* VengeanceFeelsEmpty: [[spoiler:When Steven sees into her mind, she admits harming the Crystal Gems doesn't bring her any joy ''or'' closure on Pink's death. If anything, it makes her feel ''worse'' by reminding her of Pink.]]
-->'''Blue:''' What good will any of this do? The more I make these Gems suffer, [[spoiler:the more I long to see you again, Pink.]]
* VillainHasAPoint: While she's obviously trying to [[spoiler:murder Steven during "The Trial", she is right that the court has to observe the formalities, like the defense lawyer and defendant being allowed to make a statement, and said lawyer providing evidence of Rose Quartz's possible innocence. The formalities in fact reveal a lot of holes in Pink's death. Blue has been sensing all is not right with the official story and prods him, demanding answers. And considering she thinks that Steven murdered her little sister, it's actually really merciful of her to correct him on the details of the murder, angry and sad as she is.]]
* VisualPun:
** When we finally see her without the veil, she's grieving, and not only is she ''blue'', but she has a ''long face''. And unlike the cut of Yellow Diamond's gem, Blue's is uneven by being longer at the top and shorter at the bottom, giving it a similar appearance to a teardrop — ever since Pink Diamond died, her heart has been full of grief.
** Her emotional powers force every Gem in her vicinity to feel as sad as her. ''Misery loves company''.
* WeHaveReserves: More forgivable than most cases considering Gems can reform and would be good as new given a few weeks at the absolute most, but she doesn't bat an eye over 'casualties' on her side as long as the Crystal Gems get captured.
* WellIntentionedExtremist: Her words to Pink Diamond in "Can't Go Back" at least ''try'' to have some encouragement inside:
-->'''Blue:''' ...But this is what you wanted. [[UngratefulBitch You BEGGED us for a colony of your own! And now all you want to do is be rid of it.]] First, too many organics, then their cities were too difficult to dismantle, and now these Crystal Gems? We’re ''tired'' of your excuses, Pink! This "Rose Quartz" can’t hurt you. You can’t be swayed by a few unruly Gems. ''(Pink tries to say something)'' Enough! You must understand... ''you'' are a ''Diamond''. Everyone on this planet is looking to you. You don’t even have to do anything. Just smile and wave. Show everyone you are unfazed by this little... uprising. Your Gems will fall into line and these Crystal Gems will be... no more. As long as you are there to rule, this colony will be completed.
* WhatYouAreInTheDark: She secretly kept visiting Pink Diamond's ruined palanquin on Earth at the site of her shattering thousands of years after the Rebellion, knowing Yellow Diamond wouldn't approve of her being in a place where their 'sister' was killed by a Homeworld traitor.
* WhenSheSmiles: When she breaks out of her depression and smiles her more elegant and regal features allow her to come off as endearing albeit a tad {{Adorkable}}. She gives off a cute light smile shortly after meeting Greg in "Steven's Dream". [[spoiler:and in "Legs from Here to Homeworld" she shows off a larger adorable smile, along with several more amused smiles while crying TearsOfJoy when she spends time with Yellow and "Pink".]]
* WhiteHairBlackHeart: Without the veil, she's shown to have bluish-white hair, though it's played with; she was shown to be extremely callous towards Ruby and Sapphire for accidentally fusing in "The Answer", but her cruelty doesn't extend to her fellow Diamonds, who she deeply cares for, and she seems to have developed a sense of empathy for humans as opposed to Yellow's outright contempt for organic life.
* TheWomanWearingTheQueenlyMask:
** She's highly revered by her Homeworld subjects, but behind closed doors she's a sad and depressed woman who's in perpetual mourning over her dead "sister" Pink Diamond and wallowing in her own guilt over her failure to prevent her death.
** In "Can't Go Back", she tried educating Pink on this, instructing her to "smile and wave" to show her subjects that the Crystal Gem rebellion was really nothing to worry about. [[spoiler:This is what partially led to Pink rebelling in the first place]].
* WoobieDestroyerOfWorlds: When we see her in the present day, she is obsessed with her grief over Pink Diamond, trying to gain closure from looking for answers on how exactly her 'sister' died and who did it.
* YouAreBetterThanYouThinkYouAre: Her speech to Pink Diamond was probably intended to be this, as she encourages Pink to stand strong in the face of the rebellion and tells her that she ''can'' complete the colony she begged for. [[spoiler:Shame that what she mistook for being an UngratefulBastard was actually Pink having had a HeelRealization...]]
* YouHaveFailedMe: Responds to Ruby screwing up Sapphire's visions and fusing with her by ordering Ruby's gem broken.
* YouWillBeSpared: She takes Greg with her back to Homeworld to be preserved in the Human Zoo after he shows her compassion, believing she's saving him from being killed by the Cluster ([[DramaticIrony or so she thinks]]).
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