This article is for the character, if you are looking for the gem type then look here
Stone is a (former) homeworld gem. She was shattered after talking to white diamond
Shattering
During a ball, Stone was sitting on the side of White Diamond's Throne. She decided to say "hi". She was then shattered by WD because she didnt want Overgrown Pebbles taking to her. After the ball, He shards were taken by Cats Eye Yellow
Clusterified
When steven and peridot were walking through an old cluster lab Cat Eye Blue approached them and after a short battle with Tourmaline, Cat Eye Blue was unfused. Unfortuantly, YellowEye smashed one of the tanks and "Stone" was released. After battling Tourmaline she was poofed and bubbled by Steven.