Homebrew Crystal Gem Species Details

5,750 years ago, the Gem Homeworld maintained several outposts on Earth, with plans to completely colonize the planet, but were driven off by Rose Quartz's rebellion, leaving the Crystal Gems (and various Corrupted Gems) as the only remaining Gems on the planet. 

Gems are characterized by the gemstone embedded somewhere on their body, which is analogous to a brain. However, the gem is the only true part of a Gem’s body, the only part that is unchanging and, indeed, the only part of a Gem that can be permanently damaged or killed.

Gems' humanoid shapes are projections from their gemstone which can be changed at will, described as being "like a hologram, but with mass," with their only constant feature being their gemstone and color scheme (shapeshifting is generally not permanent, and Gems will return to their "default" form eventually unless the shapeshifting was done during regeneration). As such, Gems cannot change the size or shape of their gem, which is the limiter of how small a given Gem can be. Gems refer to their physical bodies as 'Illusions.' Gems' physical forms typically have characteristics associated with human femininity, but all Gems are sexless and genderless.  

Crystal Gem Traits

Gems are an extraterrestrial species of "magical", roughly humanoid beings that play a key role in the Steven Universe franchise.

Age

Gems are immortal beings who come out of the ground fully matured. You can be any age. 

Speed

Your base walking speed is 30 feet.

Gem Type

All Crystal Gems have a magical gemstone embedded into a specific body part. This is where all of their magical powers, special abilities, and appearance traits come from. 

Type Table

Gem	Damage Type	use
Pearl	Lightning	Adds 1d10 damage to weapons with proficiencies
Ruby	Fire	Adds 1d10 damage to weapons with proficiencies
Sapphire	Cold	Adds 1d10 damage to weapons with proficiencies
Quartz	Psychic	Adds 1d10 damage to weapons with proficiencies
Lapis	Poison	Adds 1d10 damage to weapons with proficiencies
Peridot	Force	Adds 1d10 damage to weapons with proficiencies
Bismuth	Radiant	Adds 1d10 damage to weapons with proficiencies
Spinel	Thunder	Adds 1d10 damage to weapons with proficiencies
Aquamarine	Acid	Adds 1d10 damage to weapons with proficiencies

Languages

You can speak, write, and read in Gem Glyph, the ancient language of the Gems.