Peridots

Peridots were low ranking technological Gems that were mostly used as kindergarteners.

Role
Peridots served mainly as technicians and kindergarteners, sometimes performing field assignments on other planets such as the Peridot who befriended Steven and joined the Crystal Gems. Being workers, Peridots had a low rank, only being allowed into elite Homeworld areas if a job was needed to be done there.

Era-2 Peridots were given Limb Enhancers to compensate for the lack of strength and unique abilities, save for enhanced durability, older Gems had due to the depletion of resources on Homeworld. One Peridot so far was shown to have ferrokinetic abilities.

Physical Characteristics
Peridots tend to have green skin and yellow or green hair that comes in a variety of shapes. While the exact appearance of an Era 1 Peridot (if any different) is unknown, it is known that they possessed abilities which made technological enhancements unnecessary for them to perform their duties.