The Great Empathy Authority

The Great Empathy Authority is the matriarchal body of Gem leaders. Its membership mainly consists of Crimson Diamond, Violet Diamond, Green, Diamond, Champagne Diamond, Black Diamond, and Ivory Diamond. While also including the remaining 4 diamonds. They have been ruling over Gem Homeworld and its active colonies since the very beginning.

Overview
The Great Empathy Authority has complete control over every Gem and their race's endeavors. Each Diamond is responsible for overseeing a specific part of Homeworld and it's society. The Diamonds split gems up into different groups according to color or rank: some belonging to Green, Black, Ivory, Champagne, and more to Crimson Violet, Gold, and Blue. Gems wear a colored Diamond emblem on their outfit corresponding to the Diamond they serve.

In order to expand the Gem race, the Diamonds take control of celestial bodies for colonization purposes. Each Diamond own specific colonies and is in charge of making sure they are successful. The Diamonds have their own hierarchy as Ivory Diamond is considered the lowest-ranked Diamond, seeing how she is commanded by the higher orders of the other Diamonds and could not make her own decisions about colonization efforts while Crimson Diamond being ranked the highest of the Diamonds.

Displays of Loyalty
All Gems are very loyal and ultimately knows the Diamonds are the most elite beings to ever exist. Some are more passionate and enthusiastic about working for any Diamond. The loyalty Gems have for their Diamonds was such that some would do anything to avenge them. In addition to being widely regarded as a tragedy.

Appropriate & Expected Behaviors
It is mandatory for Gems to show absolute respect and loyalty to any Diamond they interact with regardless of whether or not they served them. Appropriate behaviors include addressing a Diamond (most commonly the one they belong to) as "My Diamond", saluting them by forming a diamond shape over their chest with their hands and optionally giving them many gracious titles, often to the point of boot-licking and excessive flattery before speaking with them.

At Homeworld balls like the ones run by Black, Ivory, or Champagne, the Diamonds sit on their elevated thrones while members of their court indicated their presence. Then, they can either accept or reject their court members. Specifically,

Just as other Gems are expected to behave in a certain orderly manner, the Diamonds are expected to do the same. They have to present themselves as professional and powerful yet elegant and magnificent. This was not only to set an image of themselves for the Gem race but also to other societies.

Symbols
The symbol of the Great Empathy Authority appears on many Gem structures and has only changed once over time. On the structures mostly built as early as around 18,000 years ago, the logo consisted of nine connecting diamond shapes. In addition to appearing on structures, the diamond symbol appeared on the interiors of all modern Gem ships.

Up to 20,000 years Ago
The exact history of the Diamonds themselves remains unknown, including when and how they came to be. Based on the murals in the Phion-Moon Base Crimson was created first followed by Violet, then Gold and so on. What was known was that the Diamonds are to be eternally considered the most perfect, powerful and absolutely flawless Gems by virtually all of their peers and it can be assumed this was how they rose to power over the entirety of their species, using the influence they gathered to collectively cull a following of any "lesser" Gems. When the Great Empathy Authority officially formed, the Diamonds developed and established laws and rules to govern and essentially shape Gem society to their own designs, an influence that lasted for untold eons all the way to the present.

At some point, the Diamonds imposed a social hierarchy on Gem society based on an individual Gem's abilities and skills and how they would best serve the Diamonds' goals. Those deemed better and more useful received different privileges than others; this created pockets of inferiority and superiority complexes due to inequalities and the established knowledge of numerous Gems ranking lower while fewer Gems ranked higher (in many cases). In addition, the Diamonds divided Gems into groups that appeared to partially be based on color; some belonged to Crimson, some belonged to Violet, etc. All Gems were usually required to wear uniforms with a Diamond insignia to signify the Diamond they belonged to.

The Diamonds also appeared to be in charge of different aspects of Homeworld and as such divided Gems accordingly into different groups for the purpose of carrying out related duties; Green Diamond was said to be in charge of Homeworld's military and Blue Diamond was stated to have control over Homeworld's diplomacy.

the Diamonds wish to spread their "perfection" throughout the universe and expand their race into an almighty empire. To do this the Diamonds turned the Gem species into a space-faring race, expanding outward from Homeworld to colonize other places beyond their home galaxy. Upon colonizing a suitable planet, over an indeterminate period of time, the planet's resources were used to create new Gems, installations, structures, and outposts. Worlds colonized ranged from proper planets and moons to mere asteroids. Planets possessing a biosphere of any sort were not avoided and habitable planets might have been preferred as potential colonies over barren, lifeless worlds due to rich minerals commonly found. The completion of colonization efforts on an inhabited world would inevitably lead to the extinction of all life existing on said planet and render it inhospitable to non-Gem lifeforms. Based on Homeworld's overall indifference (ranging from slight disgust to outright contempt towards organic life), it appeared there were no qualms over colonizing worlds with native or     pre-established life and what the completion of said colonization would mean for them in the long run. It is unknown how many of the Diamonds' current and previous colonies once possessed a biosphere before the completion of their colonization. Once a colony completed itself it was firmly established when Gems were created on a certain Diamond's planet they belonged to them by default. For example, Gems made on a Violet Diamond colony belonged to her. Though if a planet suitable for colonization had inhabitants Violet would keep at least two creatures as souvenirs to remember that planet or "keep them alive".

The Diamonds have a relatively strong relationship with each other and would play games with Black and Ivory. Black also hosted parties in honor of the other Diamonds' achievements and sometimes did it just for fun.