Basic Trope: Crystal is used for imprisonment.
- Straight: Princess Pearl is trapped inside a large crystal.
- Exaggerated: Everyone is trapped inside crystals.
- Justified: The Big Bad is an evil witch with crystal manipulation powers, so that's literally the only way she could imprison Pearl effectively.
- Parodied: Princess Pearl is trapped in a display case in a jewellery store at a mall
- Lampshaded: "Wow, a crystal prison. I'm both amazed, and scared!"
- Played for Horror: Princess Pearl is slowly fused with the crystal until only her brain and reorganized nerves remain as parts of it. She knows she's become the crystal itself, and she's now unable to die, and thus she will be stuck like this forever.
