"I don't appreciate your tone."
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Are you joking me?! The Diamonds are the Gem matriarchs! Together they make up the Great Diamond Authority that governs Homeworld and all the outlying colonies! We live to serve them.

Peridot, "It Could've Been Great"

"The Great Diamond Authority" is the matriarchal body of Gem leaders who rule in absolute power over Homeworld and the existing Gem colonies.


The symbol of the Great Diamond Authority appears on many Gem structures, but has changed over time. On structures built prior to the Rebellion, the symbol consists of four diamond shapes: white (top), yellow (right), blue (left), and a pink one (bottom). On modern structures, the pink symbol has been removed, leaving only the yellow, blue and white shapes (now in the form of overlapping triangles), suggesting that the Authority has been reduced in membership from four to three during that time.


Yellow Diamond

One of the Diamond leaders. She is the superior of Jasper, and many other Gems "made" for her. She is the former superior of Peridot, now a Crystal Gem. She commenced the Cluster project when Earth was deemed unfit for a colony, due to the Rebellion. According to Peridot in "Hit the Diamond" Yellow Diamond is in complete control of the Gem Homeworld's military.


Blue Diamond

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


Unknown Diamond (White)

One of the Diamond leaders. Details about her are unknown, except for the fact that her white symbol appears alongside those representing Blue Diamond and Yellow Diamond on both ancient and modern Gem structures. Due to a naming pattern (color of the Diamond) there is a possibility that this Diamond is called White Diamond.

She appears to have spiky hair and her gemstone is placed on her forehead.

Former Members

Unknown Diamond (Pink)

Pearl Uniform

Pearl in her space suit.

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

Pearl's space suit, as seen in "Space Race" and "Back to the Barn", has a pink symbol on its chest. This suggests that Pearl was previously involved with this Diamond prior to her "removal" from the Authority. Sardonyx also sports pink symbols on her feet, this most likely comes from Pearl. Alexandrite also has a pink diamond on her chest.


The Great Diamond Authority has great influence on Gems of lower caste and members of their courts. Each member of a Diamond's court wears a diamond emblem on their outfit; the color of the diamond emblem worn by followers depend on the Diamond. Members of a Diamond's court are known to show respect, such as Sapphire calling Blue Diamond "my Diamond". Some members are passionate and enthusiastic about working for a Diamond. For example, Peridot exclaims "I was made for Yellow Diamond!".


  • The current symbol might be a reference to The Triforce from The Legend of Zelda, as they both are three triangles that form a symbol.
    • The former symbol resembles the NFPA diamond, with slightly different colors (one of the diamonds is red instead of pink) and with the colors' positions switched.
  • The Great Diamond Authority was yet another theory created by Ronaldo Fryman that was proven true.
  • So far, the reason why the Diamond Authority was reduced to three members remains unknown.


Start a Discussion Discussions about The Great Diamond Authority

  • Pink is not as horrible as fans make her out to be.

    58 messages
    • Ninja72 wrote:If it was not for her, humanity would have been extinct though. Not necessarily.  The only reason Pink was given Earth as a col...
    • AlexxTerrarian wrote:I agree with her not being bad. She's just a tad forgetful (ahem, Spinel, ahem) Spinel was given specific instructi...
  • The Great Diamond Authority logo

    8 messages
    • TalkingOddlySpooky wrote:Blue was the first to give in, then Yellow and lastly White. Headcanon accepted.
    • Its 100% not an error. White literally says that Steven ushered in a new era for Gemkind. 
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