The Great Diamond Authority

"The Great Diamond Authority" is the group of Gem leaders who rule over Homeworld and the Gem colonies.

Yellow Diamond
One of the Diamond leaders. She is the superior of Jasper, Peridot, and many other Gems "made" for her.

Blue Diamond
One of the Diamond leaders. She was the superior of Sapphire, Lapis Lazuli and many other Gems "made" for her. She was once the supervisor of the colonization of Earth.

Unknown Gem (possible White Diamond)
One of the Diamond leaders. Details about her are unknown other than her white symbol found on Gem structures.

Unknown Gem
A former Diamond leader. Details about her are unknown other than her pink symbol that is present on ancient Gem structures.

Trivia

 * The Great Diamond Authority was yet another theory created by Ronaldo Fryman that was proven true.