Bismuth

Bismuth (specifically Bismuth Facet 2O5Z Cut 8QY) is one of the original members of the Crystal Gems. Before the end of the Rebellion, she and Emerald had a conflict of interests, leading to them falling out. This ultimately lead to Bismuth being poofed, bubbled, and left inside of Lucky's Dimension. Emerald then lied to the other Gems, telling them that she went missing in battle. 5,300 years later, Emerald's daughter, Ella, accidentally freed her. After her proposal had been rejected once again, she and Ella fought and she was poofed and bubbled again by her. This time, unlike Emerald, Ella revealed to the others what happened to her.