Gem Homeworld

The Gem Homeworld (or simply Homeworld) is the home planet and assumed capital of the imperialist humanoid race known as Gems.

Geography
The surface of the planet is split in half and has two opposite facing rings, one noticeably smaller than the other. However, it does not resemble what a normal Gem colony would look like. The core of the planet looks to be crystalline, bearing resemblance to a geode.

Homeworld has a breathable atmosphere and suitable gravity for humans to survive on. It is implied that it does not rain on the planet. Homeworld appears to be covered in many cities, and might be an example of an ecumenopolis.

Society
Homeworld is known to exist under a totalitarian rule by the Great Diamond Authority. The Great Diamond Authority is governed by the Diamonds: White Diamond, Yellow Diamond, Blue Diamond, and previously Pink Diamond. They act as the tyrannical leaders of the Gem species and society as a whole. The Gems that reside on the planet, as well as any other born under the Diamond Authority, are put under a strict caste system depending on their gemstone, which is predetermined.

The advanced technology of the Gems give them the ability to travel through space instantaneously, create other Gems, and even destroy or colonize entire planets which both result in the destruction of the native lifeforms. The Gem empire is known to intergalactically maintain a vast growing number of colonized planets.