The monster was defeated by Pearl and she tried to bubble her gem, but it was too heavy to carry. Amethyst jokingly offered to help by shapeshifting into Pearl with an exaggerated bodybuilder physique but accidentally hit Pearl, who was carrying the bubble. The Corrupted Gem escaped and had a new, stronger form. With the team's cooperation, she was defeated once more.
Her gemstone resembles a real-life geode, a plain rock on the outside but with crystals in the inside.