Nephrites

Nephrites are types of Gems, usually in charge of piloting ships, including Homeworld Dropships. All Nephrites shown so far, including "Centi", have been voiced by Aparna Nancherla.

Role
Nephrites are in charge of piloting Homeworld Dropships begin colonizing other planets and may also serve as pilots for various other types of ships. Their rank in the caste system is never clearly stated but appears to be high considering they captain their own ships and Yellow Diamond was shown to contact a Nephrite captain directly in "Jungle Moon", something she would not do with a lower-ranking Gem. Numerous Nephrites were corrupted, with one (known as "Centi") formerly being a captain in charge of other Nephrites (in command of a dropship that went to Earth). These Gems flew in Gem spaceships and started building structures on Gem colonies.

Nephrite Facet-413 Cabochon-12 ("Centi")
Known as "Centipeetle" or "Centi" while corrupted, Nephrite Facet-413 Cabochon-12 is a Gem that was sent from Homeworld with her crew to start building the colony on Earth. However, she got caught in the war and was separated from her crew. She was ordered to retreat, but was unable to find her crew and board her ship in time and suffered from the attack caused by the Diamonds, resulting in her corruption.

Unknown Nephrites

 * Unknown Nephrite - Pearl once took a Nephrite out of the cockpit of a dropship during the Rebellion.
 * Hessonite's Nephrites - A group of Nephrites working on Hessonite's warship. They are said to be performing a drill at the time of the Crystal Gems' arrival to the ship. They are mentioned in Save the Light.
 * Nephrite Facet-XJ Cut-763 - A Nephrite who works for Yellow Diamond. In the flashback from "Jungle Moon", she shows hesitation for doing her job as the planet they are terraforming has organic life; Yellow Diamond ignores her complaints and demands for her to do her job or else she will shatter her and her crew personally.

Nephrite's Crew
Nephrite's Crew is a group of various formerly-corrupted Nephrites whose captain was Nephrite Facet-413 Cabochon-12 ("Centi"). Two of these Nephrites, then corrupted, debuted in "Monster Reunion".

They did not evacuate Earth when ordered to as they did not want to leave their captain behind, and as a result they also became corrupted. Beginning with "Monster Reunion", they lived together in the Ancient Gem Colony Ship.

They, along with their captain, were uncorrupted by the Diamonds in "Change Your Mind" at Rose's Fountain. Seven Nephrites are visible with their captain in the fountain's pool.