Corrupted Gems

"All those monsters we fight used to be just like us!"

"Gem Monsters" are former Gems who have become corrupted. The Crystal Gems take care of them, subdue them, and contain them.

List of Gem Monsters

 * Centipeetle Mother
 * Ice Monster
 * Giant Pufferfish
 * Worm Monster
 * Gem Cave Creature
 * Invisible Gem Monster
 * Big Bird
 * Heaven Beetle
 * Earth Beetle
 * Lighthouse Gem Monster
 * Tardigrade Gem Monster
 * The Slinker
 * Crab Gem Monster

Trivia

 * Pearl states in "Ocean Gem" that all the creatures they have battled/fought thus far are corrupted Gems.
 * This confirms that the form the Centipeetle Mother takes upon its release from the bubble is its human shape.
 * This also explains why these creatures have a gemstone, and have the ability to regenerate.
 * It is currently unknown as to what it is that caused other Gems to turn into these creatures.