Quartzes

Quartz
All Amethysts shown thus far, including the Crystal Gems' Amethyst, are voiced by Michaela Dietz.

All Jaspers (including "Skinny" and Pink Diamond's Jasper) and the defective Carnelian are voiced by Kimberly Brooks.

All Amethysts, Jaspers, and Carnelians stationed at Pink Diamond's Zoo were made on Earth, and were subordinates of Pink Diamond, until being reassigned to Blue Diamond after she was shattered.

History
Four Amethysts appear in "Gem Heist"; two of them are in charge of guarding the door in the Zoo's cargo bay. The two Amethysts tease the Crystal Gems when they land on the Zoo, resulting in a scolding from Holly Blue Agate. Later in "Gem Heist," another pair of Amethysts send Steven into the Zoo's tunnel, one with a square-faceted gemstone.

In "The Zoo," several Amethysts are seen entering the boundaries of Pink Diamond's Zoo to console the heartbroken Zoomans. One Amethyst later angrily informs Greg and Steven of the trouble they are in.

In "That Will Be All", this turns out to be a prank by Amethyst and the many other Homeworld Quartz guards she has met (whom she refers to collectively as "the Famethyst"), three of which having been formed right above her. These Amethysts inform her of her serial number being Facet-5 Cut-8XM. Among the Amethysts and Jaspers are two defective Gems: "Skinny", a tall and skinny Jasper, and Carnelian, shorter than most Quartz.

From this interaction, it can be assumed that Quartz Gems are generally good-natured (with Jasper and Holly Blue Agate being exceptions), as "the Famethyst" does not hold any grudge against the Crystal Gems.

In "Now We're Only Falling Apart", numerous Amethysts are shown emerging out of the Prime Kindergarten in a flashback from Pearl.

In "Together Alone", several Amethysts and Jaspers are shown in the crowd of Quartz Gems dancing alongside the Crystal Gems' Amethyst during the Era 3 Ball.

"Now We're Only Falling Apart"
Many Amethysts appear in Pearl's flashback, all of which emerging from the Prime Kindergarten.

"Together Alone"
Several Amethysts attend the Era 3 ball, seen dancing along with several Jaspers.

"That Will Be All"
Several Jaspers from the Beta Kindergarten debuted in That Will Be All. Like the Amethysts, they originally belonged to Pink Diamond but now served Blue. Despite their gem type, they are all considered members of The Famethyst.

"Together Alone"
Two identical Jaspers attend the Era 3 ball, seen dancing along with several Amethysts.