Orange Spodumene

The Worm Monster is an unnamed creature that inhabited the bottom of the ocean. It had a gem that was collected when it was defeated.

"Bubble Buddies"
In "Bubble Buddies," the Worm Monster is seen at the bottom of the ocean, eating glowing seaweed. The creature then dives into the ground causing the ground to shake and crack, making Steven and Connie fall into a pit. The monster re-appears after Connie and Steven reach the top of the ocean and chases them to shore. Steven notices the creature is attracted to Connie's bracelet because it glows. He grabs it and leads the monster around the pier supports causing them to break and then fall onto the Worm Monster.