

In some circumstances, Gems may become "corrupted", compromising both their physical form (which turns into a monstrous, unrecognizable creature) and their sapience, although they may still be restored to normal if their gemstone is properly healed. They live for millennia and can only be injured if the gemstone itself takes damage. Since their humanoid bodies are merely a projection, Gems don't age physically and can basically survive in any environment, including space vacuum.

Each caste has its own role in their rigidly hierarchical society, and its own social status. Dozens of different castes are known, each differing in size, basic appearance and abilities. The location of the gemstone varies according to each individual, and the type of gemstone is determined by their caste. Their physical bodies consist of the mineral gemstone that they all possess, which is visible in some part of their projected humanoid bodies.

Rebecca Sugar Gems are a sapient extraterrestrial race with seemingly-magical abilities which hail from an extra-galactic world known simply as "Homeworld", although a large number of them has also settled on and currently reside on Earth.
