Amethyst 84

A gem who mainly does patrol duty. They are partners with their identical twin, Amethyst 33.

The twins work in tandem for most things, often talking at the same time or finishing each other's sentences. No one really cares which is which anymore, including themselves. Because twin gems won't break by touching each other, the Amethysts have a habit of clanging their heads together, much to the chagrin of the other gems.

Later, Eighty-Four switches their hairstyle to deceive Phos in order to go to the moon in Thirty-Three's place. On the moon, Eighty-Four has become their own individual and serves as an assistant scientist there. They seem to be highly interested in more of the psychological aspects in the science field.