From Wikipedia -
Graptopetalum is a plant genus of the family Crassulaceae. They are perennial succulent plants and native to Mexico and Arizona. They grow usually in a rosette. There are around 12 species in this genus.
Species Description
Graptopetalum amethystinum
Graptopetalum bellum, aka Tacitus bellus
Graptopetalum paraguayense, Sedum weinbergii, Mother of pearl plant, Ghost plant