Board Thread:General Discussion/@comment-4224349-20150205230904/@comment-25464947-20150206165348

@Bloo Yup, that's the probably the best human equivalent. There have also been some theories going around that the gems are organized by a literal class system (Pearl and Peridot = "engineer" class, Garnet = "enforcer" class, and Amethyst = "worker" class). I have always kind of imagined that Lapis and Rose are "queens" of some kind, since they both have extrordinary elemental powers, the ability to summon/create guardians, physical features that distinguish them from other gems (Rose's height and massive hair, Lapis' wings), and dual names instead of single word names.

Of course, there is still the question of whether Pearl and Amethyst were born naturally or if they themselves were seeded/grown on other planets. Now that I think about it, this also explains why the homeworld gems are interested in earth: They probably exhausted the supply of gemstones on their own planet and need to farm other planets so that they can keep reproducing. Since gems can die and have no natural means of reproducing, they might go extinct if they ever ran out of gemstones.