The Great Diamond Authority

"The Diamonds, unique in their flawlessness, sought to expand their perfection across the galaxy."

The Great Diamond Authority is the matriarchal body of Gem leaders consisting of White Diamond, Yellow Diamond, Blue Diamond, Steven Universe, and formerly Pink Diamond. They are the absolute ruling power over the Gem Homeworld and any of its remaining colonies still in existence.

Overview
The Great Diamond Authority has complete control over every Gem and their race's endeavors. Each Diamond seems to be responsible for overseeing a specific part of Homeworld society. The Diamonds appear to split Gems up into groups; some belonging to Yellow, others to Blue and more to White. 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 planets and nearby celestial bodies for colonization purposes. Each Diamond owns specific colonies and is in charge of making sure they are successful. The Diamonds seem to have their own hierarchy as Pink Diamond was considered to be the lowest-ranked Diamond, seeing how she was bound and commanded by the higher orders of Yellow and Blue and could not make her own decisions about her colonization efforts. White Diamond, however, ranks the highest out of the Diamonds.

Displays of Loyalty
Most Gems are very loyal and legitimately believe the Diamonds are the most elite beings to ever exist. Some members are passionate and enthusiastic about working for any Diamond. The loyalty Gems have for their Diamonds is such that some will do anything to avenge them. In addition to being widely regarded as a tragedy, Pink Diamond's "death" incited more than a few Gems to go so far as to seek vengeance on her behalf.

Appropriate & Expected Behaviors
Gems must show absolute respect and loyalty to any Diamond they interact with regardless of whether or not they serve 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 bootlicking and excessive flattery before speaking with them. At Homeworld balls, like the ones formerly ran by Pink Diamond, the Diamonds are to sit on their elevated thrones while the members of their court indicate their presence. Then, they can either accept or reject their court members. Specifically at the Era 3 Ball, Steven witnesses this when Gems line up at his throne, believing him to be Pink, and tell him "Pink Diamond! It's wonderful to be in your presence" followed by "Wow! So radiant and sparkly!", and "Wow! So radiant and exquisite!"

"Pink, quit fooling around! White Diamond is going to be there! We have to present her with our best possible selves, just as our Gems present us with their best possible selves."

Just as Gems are expected to behave in a certain, orderly manner, the Diamonds are expected to do the same. They must present themselves as professional and powerful, yet elegant and magnificent. This is not only to set an image of themselves for the Gem race, but also for White Diamond, who is the highest-ranking Gem in the entire empire.

Symbols
The symbol of the Great Diamond Authority appears on many Gem structures and has changed over time. On structures mostly built as early as around 6,000 years ago, it consists of four connecting diamond shapes: white (top), yellow (left), blue (right) and pink (bottom). On modern structures and Nephrite's (the partially-healed Centipeetle's) drawings in "Monster Reunion" the Pink Diamond symbol has been removed leaving only the white, yellow and blue symbol shapes (now in the form of overlapping triangles; it was also only three connecting diamond shapes in Nephrite's drawings). In addition to appearing on structures, the redesigned symbol appears on the interiors of all modern Gem ships.

Eons Ago
The exact history of the Diamonds themselves is unknown, including when and how they themselves came to be. Based on the murals in the Moon Base and the drawings from "Familiar", White Diamond was created first, followed by Yellow, then Blue and finally Pink. What is known, however, is that the Diamonds were to be eternally considered the most perfect, powerful and absolutely flawless Gems by virtually all of their peers, and it can be assumed this is how they rose to power over the entirety of the Gem species, using the influence they gathered to collectively cull a massive following of any "lesser" Gems. When the Great Diamond Authority was officially formed, the Diamonds developed and established several laws and rules to govern and essentially shape Gem society to their own designs, an influence that has 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 both 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 order to keep the system intact, "fusions" between two or more different types of Gems was and is still not allowed. This prevented two or more lower-class Gems from fusing and altogether becoming a different Gem, usually one considered higher up in the system. In addition, the Diamonds divided Gems into groups that appeared to partially be based on color; some belonged to White, some belonged to Yellow, 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 any related duties; Yellow Diamond was said to be in charge of Homeworld's military and Blue Diamond was stated to have control over Homeworld's diplomacy.

According to "Your Mother and Mine", the Diamonds wished to spread their "perfection" throughout the universe and expand the Gem race into a greater almighty empire. To do this, the Diamonds turned the Gem species into a spacefaring 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 the rich organic minerals commonly found there. As stated time and again before and first shown in "It Could've Been Great", the completion of colonization efforts on a habitable world would inevitably lead to the extinction of all life existing on said planet and render it inhospitable to non-Gem lifeforms. Based off Homeworld's overall indifference, if not ranging from slight disgust to outright contempt towards organic life, it appears there were no qualms over colonizing worlds that had native 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 was completed, it was firmly established when Gems were created on a certain Diamond's planet that belonged to them by default. For example, Gems made on a Yellow Diamond colony belonged to her.

The Diamonds had a very close relationship with each other, and would often play games with Pink. Pink also hosted parties in honor of the Diamond's achievements. However, Pink had begged Yellow and Blue for a colony until finally Yellow gave in despite her doubts and placated her by giving her Earth. Around the start of Earth's colonization, the Diamonds had altogether colonized 43 planetary bodies and two star systems (again according to the Moon Base).

Over 6,000 Years Ago
Pink Diamond and her Gems arrived on Earth and began the process of colonizing the planet, constructing several Gem installations and structures including the Prime Kindergarten. After several years of relative inaction, Pink became bored concerning the reality of actually managing a colony. When informed by her Pearl the first Quartz soldiers were emerging from the Kindergarten, she expressed an immediate desire to interact and socialize with them but quickly dismissed the notion due to it being unbecoming of a Diamond in the eyes of Blue and Yellow. It is at this time Pearl remarked how she could shapeshift into a Quartz, thus leading to Pink creating her "Rose Quartz" persona.

When Pink became fascinated by the organic life on Earth's surface, she eventually realized the colonization process was harming the life already present on the planet itself. Over the next several years, she began a prolonged series of discussions involving her begging Yellow and Blue Diamond to allow her to spare Earth from such a fate. As a result, Blue Diamond created a human zoo to satisfy Pink Diamond, but this only served to further enrage her. After countless attempts by Pink to convince Blue and Yellow to let her properly preserve life on Earth, Pink decided to use her alter ego of Rose Quartz to scare other Gems off Earth alongside Pearl by staging a Rebellion.

Over 5,750 Years Ago
In an attempt to assist Pink Diamond in suppressing the Rebellion and desperate to complete the colonization of Earth, Blue Diamond sent her court with her to the Cloud Arena to investigate the uprisings. Among these Gems was a Sapphire who came to Blue and told her she foresaw the rebels attacking the Arena, but that they would be cornered and captured after "poofing" two of the Rubies protecting her along with herself and some Gem bystanders, ending the rebellion. As told, Rose and Pearl attacked Blue Diamond's court and everything played out according to Sapphire's prophecy until one of Sapphire's Ruby guards saved her from Pearl causing them to accidentally fuse into a Gem named "Garnet".

Disgusted and distracted by the fusion, Blue Diamond told Ruby she would be "shattered" for fusing with a member of her court and allowing the rebels to escape. Despite Ruby's protests, a distraught Sapphire fled with her into Earth's wilderness where they again came across Rose and Pearl, this time joining the Rebellion they had fought against as Garnet. After encountering Garnet, Rose Quartz/Pink Diamond revised her earlier desire to scare gems off Earth to fighting not just for life on Earth, but for other Gems' freedom.

Once again at Earth's Moon Base, Pink Diamond held an audience with the other Diamonds once more requesting the cessation of Earth's colonization, informing them this time it was because of the newly-formed group of Homeworld rebels calling themselves the "Crystal Gems". Even Blue Diamond became irritated by Pink's excuses and explained Rose Quartz could not hurt her and she could not be allowed to halt the progress of a single colony due to rebellious Gems. Blue explained that as a Diamond, all Pink had to do was smile and wave while her Gems completed Earth's colonization and the superior forces of Homeworld made sure the Crystal Gems were to be no more.

Over 5,500 Years Ago
Under her Rose Quartz disguise, Pink Diamond recruited enough Gems to her cause to officially wage open war against Homeworld. Over the course of the next 1,000 years, countless Gems on both sides of the conflict were shattered in the ensuing battles and any plans of continuing the colonization of Earth began to crumble. Pink (as Rose) was more or less able to keep the Crystal Gems in contention with Homeworld's forces due to her unique healing abilities.

Over 5,000 Years Ago
As the Rebellion continued to rage on with no end in sight, Pink Diamond (as Rose Quartz) began to fear that soon there would be no one and nothing left to protect. Eventually, she decided she no longer wanted to be a part of the Great Diamond Authority and came to believe the other Diamonds did not truly care for her, only doing so and showing affection for their own ambitions of establishing a more "perfect" empire as their endgame. Thus, to cut her ties from Homeworld permanently and end the Rebellion once and for all, Pink devised a plan to fake her shattering at the hands of her alter-ego. At the Rebellion's climax, she set this plan into motion; using her natural abilities to turn ordinary dirt into false pink Gem Shards, she consumed them and had Pearl shapeshift into Rose. "Rose" then "shattered" her with a sword in public outside her palanquin, causing everyone (including the other Diamonds) to believe Rose Quartz assassinated Pink Diamond. The plan succeeded, allowing Pink to reform and live the rest of her life as Rose Quartz while the presumed death of Pink Diamond sent Homeworld into disarray, turning the war in the Crystal Gems' favor. Unfortunately, this singular act would turn out to be a massive and devastating error in judgment on Pink's part.

Over 4,500 Years Ago
With the "death" of Pink Diamond, it became clear to Homeworld that Earth was no longer fit to be a Gem colony. Presumably, under Yellow Diamond, loyal Homeworld Gems began collecting fallen shards of shattered Crystal Gems and experimented with them. In these horrific and painful experiments, various Gem shards were forced to fuse together creating monstrous amalgamations of limbs. After enough experimentation, a gargantuan Gem geo-weapon called "the Cluster" was created and embedded into Earth's deep mantle for the sole purpose of one day destroying the planet upon forming and to be utilized as a planet-destroying superweapon.

As the Crystal Gems' victory in the war became more apparent, the Diamonds sought their own extreme measures to end the war, enraged at the loss of Pink Diamond and Earth as a colony. At the war's end, they instructed Homeworld commanders on Earth to initiate a mass evacuation of all loyalist Gem forces off the planet. Due to the abrupt and chaotic way it was carried out, not all of Homeworld's forces were able to leave in time before the three remaining Diamonds combined their powers and launched a bright light of powerful energy at Earth. They hoped this last-ditch attack would obliterate every rebel Gem still on the planet. Unbeknownst to them, both Homeworld Gems who had failed to evacuate as well as virtually all remaining Crystal Gems exposed to the light survived, but at the terrible cost of enduring a fate possibly worse than death. They became corrupted and mutated into monstrous, feral creatures with their sentience stripped.

The Diamonds and Homeworld left Earth, completely unaware of the fates they had brought upon the Gems there. Only a very small number of Gems survived the attack and avoided corruption. Pink Diamond (as Rose Quartz), Garnet and Pearl survived thanks to Pink's shield which protected them from the light's effects. Lapis Lazuli, who was imprisoned in a mirror was protected from exposure to the light; Bismuth, who was similarly imprisoned via being bubbled was inadvertently protected; Amethyst, who was still incubating was also protected from the light. With the Diamonds having abandoned the Earth, the Rebellion had ended in a technical Crystal Gem victory, but at a terrible cost. No other Gem, whether they had allegiance to the Crystal Gems or Homeworld was known to have survived unscathed from the Diamonds' final attack. With the "death" of Pink Diamond, the Diamonds divided her still-loyal Gems amongst themselves; some went to Yellow, some went to Blue and the others presumably went to White.

Due to putting an extensive amount of their preexisting resources into colonizing Earth and then later waging a costly war to suppress the insurrections of the Crystal Gems, a resource crisis emerged on Homeworld following the conclusion of the Rebellion. With the colonization of Earth being a failure, Homeworld received no net profit from their endeavors and thus the stock of Homeworld's supplies plummeted in the years following the Rebellion's end. As a result, the strengths of Gems produced after began to dwindle. This period of time that continues on in the present is known as "Era 2", while the time predating the Rebellion was known as "Era 1". When Era 2 began, most of Blue and Pink Diamond's Quartzes made on Earth took over Pink Diamond's zoo in her memory. Also, Era-2 Gems such as newer Peridots were physically weaker due to Kindergartens lacking resources and became very dependent (and ultimately over-reliant) on advanced technological enhancements.

Pink Diamond continued to live on as Rose Quartz with the last remaining Crystal Gems, Pearl and Garnet. At some point, Amethyst emerged long past overdue in the Prime Kindergarten and was welcomed with open arms by Rose into the Crystal Gems. Over the next several millennia, they continued to protect the Earth and desperately tried to heal the Corrupted Gems. She eventually fell in love with a human named Greg Universe and gave up her physical form to have a son named Steven.

As the years went on, the Diamonds continued colonizing worlds and Pink's "death" affected each of them. White Diamond went into seclusion, not leaving her ship for eons. Blue went into a deep depression and would constantly mourn over Pink to the point where she began to forego her duties of ruling the Gem empire. Meanwhile, Yellow tried pushing Pink out of her memory and erasing any remnants of her legacy she could in order to keep herself a composed leader. Yellow tried having many discussions with Blue over the subsequent millennia about how they should move on from Pink, but Blue never listened.

Season 1
Yellow Diamond wished to know how the Cluster was progressing inside of the Earth. She assigned one of her Peridots to check the Cluster's status. When Peridot discovered there were Gems still on Earth, Yellow Diamond assigned a veteran Jasper to protect her and a time lost Lapis Lazuli to serve as an informant when she visited the planet.

Season 2
Steven and the Crystal Gems were able to thwart their plans but Peridot managed to receive the information for Yellow Diamond acknowledging the Cluster was emerging as scheduled to destroy Earth. Since the Crystal Gems destroyed her ship, Peridot found herself stranded and tried to contact Yellow Diamond through the Communication Hub but there was never a response. Eventually, she found a Diamond Communicator at the old Moon Base and contacted Yellow Diamond that way, allowing herself to talk to her directly.

Peridot reported the Cluster would emerge shortly which Yellow Diamond found pleasing. However, due to being swayed by the Crystal Gems, Peridot requested they terminate the Cluster because it would mean sacrificing all of Earth's resources for a single weapon. Peridot reported she had already devised a plan to use Earth's resources without disrupting the organic life but Yellow Diamond did not care to hear her out. Because of this, Peridot insulted Yellow Diamond and became an ally to the Crystal Gems. After the call ended Yellow Diamond furiously attempted to terminate Peridot by remotely detonating the Communicator.

Season 4
Blue Diamond visited Earth, specifically the location where Pink Diamond was allegedly shattered believing it would be the last time she would get to visit the planet before the Cluster destroyed it. Steven tracked down her location with his father Greg when he started having dreams where he saw through her eyes and cried her tears. When they arrived Greg revealed himself to Blue Diamond's Pearl, who took him to Blue Diamond. While crying, Blue Diamond explained her confusion that a fragile race such as humans could thrive on Earth but on the exact same world a Diamond could've been believed destroyed. Greg offered Blue his condolences and explained he also lost someone and understood how she felt (the two never realized they were mourning over the same being). Touched by Greg's sympathy, Blue Diamond abducted him to take him to Pink Diamond's Zoo believing she was sparing him from the Cluster, obviously unaware of its then-inconceivable nullification a while before her visit.

At the Zoo, Blue Diamond entered Pink's room and began crying again. Yellow came in and was visibly annoyed, telling Blue she should still shatter all of Pink's Rose Quartz gems because she was supposedly shattered by one of them, but Blue wished to preserve all of Pink's gems and her legacy as a whole. Yellow Diamond, her Pearl, and Blue Pearl sing in an attempt to make Blue feel better. They tell Blue that for the good of the Gem race's empire she has to move on and become a strong leader instead of moping around all of the time. When the Crystal Gems came to infiltrate the Zoo in order to save Greg, they told the Gems working there they were dropping off Steven for the Zoo as a special delivery for Blue Diamond. The administrator of the Zoo, Holly Blue Agate brought Sapphire to Blue Diamond and told her she foresaw her wanting more humans for the Zoo. Blue Diamond believed Sapphire (though surprisingly not recognizing her or the Ruby who was with her from long ago), saying the window to preserve the Earth's inhabitants was closing due to the Cluster. Yellow realized that was what Blue wanted and when she discovered the Cluster hadn't emerged yet, she told Blue there was still time to collect humans.

When Peridot first discovered Gems still on Earth, Steven listed off some of his human friends which Peridot reported to Yellow Diamond. Using this list, Yellow and Blue sent two elite Gems, an Aquamarine and her Topaz assistant to Earth to retrieve them. In order to save his friends, Steven reluctantly turned himself in as Rose Quartz, the Gem believed to have shattered Pink Diamond.

Season 5
Topaz and Aquamarine took Steven and Lars, the latter of whom was caught when he failed to escape from Aquamarine's personal ship to Homeworld where he was put on trial in front of Yellow and Blue Diamond for the murder of Pink Diamond. Yellow wished to just get the trial over with so Steven could be shattered, but Blue wanted to hear him out. After the Diamonds' defense finished stating the case, Steven tried explaining what happened even though he has no idea, which only made Blue upset when he got all the facts wrong. Steven's lawyer explained witnesses said Pink stepped out of her palanquin when Rose attacked her from the front, but that did not make any sense because Rose Quartz wouldn't be able to get past all of Pink's Gems. She stated that only someone of supreme authority could meet with Pink personally, and blames Pink's murder on one of the Diamonds. Furious, Yellow poofs both of the Zircons. Blue yelled at Yellow, asking her to restrain herself. While they are distracted, Steven escapes on Blue Diamond's palanquin and Yellow warns him that he is on their world now.

Blue and Yellow Diamond then made a trip to Earth to awaken the Cluster, which Yellow did by slamming her ship into the ground. This popped its bubble and allowed the Cluster to form a hand which ended up wrestling with Yellow Diamond's ship. Meanwhile, Blue noticed the Crystal Gems and stepped out of her ship to battle them. Suddenly, Lapis returned to Earth to join the Crystal Gems. The Cluster is able to wrestle Yellow's ship onto Blue's which crushes both ships and Blue Diamond. Both Diamonds emerged from the wreckage to further battle the Crystal Gems together. The Diamonds were able to get the upper hand, Yellow poofing Peridot, and Lapis and knocking Steven unconscious. Steven then awakened in a ghost-like state and telepathically told the Diamonds he had Pink Diamond's gemstone. This caused the Diamonds to cease fighting. Steven then awakens to find the Crystal Gems and the Diamonds watching him, with Blue Diamond exclaiming: "It's you... Pink!"

After the revelation that Steven had Pink Diamond's gemstone, Blue and Yellow Diamond are incredibly relieved that she was never shattered after all and were willing to be civil with Steven and the rest of the Crystal Gems. They reveal that they were completely unaware of the corruption that befell the Gems who remained on Earth, as the attack was actually intended to entirely destroy them. After they are able to only temporarily succeed in uncorrupting Nephrite, Blue and Yellow Diamond wonder if White Diamond may be able to help but quickly attempt to dismiss the idea, owing to White's supposed temper. However, after Steven insists, they decide to return to Homeworld using Pink Diamond's ship in order to try to enlist her help. Upon arrival to Homeworld, which appears to be in a highly damaged state, White Diamond's Pearl appears and summons Steven (referring to him as Pink Diamond as well) to appear before White Diamond. When he appears in her palace, White Diamond puts on a calm and motherly demeanor in welcoming him back but also acts quite dismissive and condescending, repeatedly cutting him off and referring to the Rebellion and the overall events that have transpired on Earth as a "little game" before sending him off without warning.

After that, he had his first time in his mother's palace and first met with Pebbles and met Yellow in the Extraction Chamber and Blue in the Pool Chamber. He had a perfect fit in his sizes of his mother's clothes. The Pebbles making furniture all night and prepare for Era 3 Ball.

Later, Steven gets Yellow and Blue to agree to a ball in order to get a chance to talk to White about the corrupted gems, but this fails, with White not coming and Steven accidentally fusing with Connie, resulting in Yellow throwing them into a prison tower.

White Diamond
White Diamond is the head of the Great Diamond Authority and the paramount ruler of all Gems and the intergalactic Gem Empire. She governs Gem society as she fits in her own fundamental ideology of perfection, though she refrains from leaving her own ship and instead leave her duties to Blue Diamond and Yellow Diamond.

In "Legs From Here to Homeworld", it is explicitly stated that she isn't like other Gems or even the other Diamonds. Blue and Yellow Diamond affirm this with Blue stating she hasn't left Homeworld in eons.

Known Subordinates

 * Pink Pearl

Colonies

 * 28 planetary bodies (by the time of the Earth's colonization)

Yellow Diamond
Yellow Diamond is one of the Diamond matriarchs. She is the former superior of Peridot as well as the current superior to other Gems made for her. As the commander of Homeworld's military, Yellow's role is to colonize other worlds in conquest and expansion of the Gem Empire. She commenced the Cluster as a project to acquire a "geo-weapon" after the Earth was deemed unfit to be a colony after the Crystal Gem rebellion.

Almost all of her subordinates (except her Pearl, "Doc" and "Navy") have a small yellow diamond insignia on their chests in two symmetrically connecting diagonal black lines.

Subordinates

 * Yellow Pearl
 * Topazes
 * Topaz
 * Two Topazes
 * Jasper (a former subordinate of Pink Diamond)
 * Prosecuting Zircon
 * Emerald
 * Nephrite-XJ Cut-763
 * Nephrite-XJ Cut-763's crew
 * Unknown Agates
 * Rubies
 * "Doc"
 * "Eyeball"
 * "Army"
 * "Navy"
 * "Leggy"
 * Citrines
 * Jades
 * Hessonite (Save the Light)
 * "Squaridot" (Save the Light)

Past Subordinates

 * Peridot (traitorous)

Colonies

 * The Jungle Moon's planet (formerly)
 * Multiple asteroid mines
 * 2 star systems and 7 unknown planetary bodies in total (by the time of the Earth's colonization)
 * Hundreds of crystal system colonies

Blue Diamond
Blue Diamond is one of the Diamond matriarchs. She was the superior of Ruby and Sapphire, and many other Gems made for her. According to Blue Diamond herself, she is responsible for enforcing the laws and rules of the Gem Empire promulgated by White Diamond. Her subordinates have a large blue diamond on their bodies, or a similar design to Yellow Diamond's subordinates, with a small light Blue Diamond insignia on their chests in two symmetrically connecting diagonal dark lines.

According to Rebecca Sugar, blue-colored Gems are oriented towards diplomatic roles.

Subordinates

 * Blue Pearl
 * Holly Blue Agate
 * Aquamarine
 * Unknown court members
 * Other Rubies
 * Unknown Amethysts
 * Two Topazes
 * Several former subordinates of Pink Diamond
 * Amethysts
 * Jaspers
 * Carnelian
 * Prosecuting Zircon
 * Defending Zircon (alignment unknown)
 * Comby
 * Jades

Past Subordinates

 * Sapphire (traitorous)
 * Ruby (traitorous)
 * Lapis Lazuli (traitorous)

Colonies

 * 9 unknown planetary bodies (by the time of the Earth's colonization)

Steven Universe
Steven is newest and yonguest out of all the Diamond matriarchs, having only been considered in since the initiation of the Era 3 Ball. He stands in the place of his mother, Pink Diamond, bearing her name as a persona. He is the superior to Amethyst.

Known Subordinates

 * Amethyst (a former subordinate of Pink Diamond)
 * Pearl (a former subordinate of Pink Diamond)
 * Jades (former subordinates of Pink Diamond)

Colony

 * Earth (crystal system)

Pink Diamond
Pink Diamond was a former member of the Great Diamond Authority. When she was a recently created Gem, she begged the other Diamonds for a colony until she was finally given one, Earth. Her subordinates had outfits similar to the current outfits of all currently seen Diamond subordinates with a small Pink diamond insignia on their chests in two symmetrically connecting diagonal black lines. Once the colonization of Earth began, Pink became so fascinated by the organic life that lived on the planet that she later decided she did not want to go through with completing the colony. Pink came up with multiple excuses to the other Diamonds as to why they should not continue colonizing Earth, but they would not listen. Eventually, Pink created an alter-ego named Rose Quartz by shape-shifting into a Quartz soldier. As Rose, Pink and her Pearl rallied up enough Gems who felt how they felt and started the Rebellion. Upon meeting Garnet, she decided to turn the Earth into a haven for other outcast Gems.

For most of the Rebellion, Pink led a double life, leading her fellow rebels as Rose, and shapeshifting back to continue serving as a Diamond. Pink used the Crystal Gems as another excuse to why they couldn't colonize Earth, but the other Diamonds would still not listen. She eventually decided she wanted to leave her life as a Diamond behind and live as Rose Quartz forever on Earth with the Crystal Gems and humans. Pink Diamond crushed some dirt and turned it into pink shards which she ate. She had Pearl shapeshift into Rose Quartz and poof her in public, leaving the shards behind. Everyone who witnessed the event believed Rose Quartz shattered Pink Diamond and only Pink and her Pearl knew the truth. Pink then reformed as Rose Quartz and led the Crystal Gems to a rather Pyrrhic victory. The other Diamonds took her "demise" harder than anticipated, unleashing a blinding light that corrupted most Gems unfortunate enough to remain on Earth.

Pink Diamond's "death" has affected both the existing past, present and future Gems in many different ways. Some Gems, like the Diamonds and those who served her, like Jasper continued mourning her and showing animosity towards Rose, not knowing they were the same person. Others, like the defending Blue Zircon, tried to make sense of what really happened to Pink. The Zircon even questioned how Rose Quartz - a Gem identified as a threat - was able to slip past Pink Diamond's guards and entourage in the first place. Her role in the Diamond Authority has been taken over by her son, Steven Universe.

Past Subordinates

 * Pearl
 * Nephrites
 * Nephrite Facet-413 Cabochon-12 (Centipeetle)
 * Nephrite's Crew
 * Quartzes
 * Agates
 * Rose Quartzes
 * Jaspers
 * Jasper
 * "Skinny" Jasper
 * Amethysts
 * "The Famethyst"
 * Carnelian
 * Unknown Quartzes
 * Sapphires
 * Jades
 * Pebbles
 * Pink Pearl

Past Colony

 * Earth

Many Era 2 Gems appear to be largely unaware of the Rebellion, as evidenced by Peridot's ignorance of the Crystal Gems in "Marble Madness". This suggests that events about everything leading up to Pink Diamond's "death" are not frequently discussed, which may be indicative of the devotion and respect Gems have for the Diamonds; this extends to the point where the rebellion was blatantly covered up.

Trivia

 * All of the Diamonds have diamond-shaped (rather than circular) pupils.
 * The confirmed instrument of the Diamonds is a synthetic sound combining harmonette and strings, processed by a synth, this can also be heard in "Same Old World" and "Monster Reunion" when the Corrupting Light flashes. It was revealed in the Steven Universe: Art & Origins book that each Diamond also has a unique chord.
 * The current symbol might be a reference to the Triforce symbol from The Legend of Zelda, as they both are three connecting triangles that form a symbol. It also bears a resemblance to the Mitsu uroko emblem of the Hōjō clan.
 * The former symbol resembles the NFPA 704 diamond symbol, with slightly different colors (one of the diamonds is red instead of pink) and with the colors' positions switched.
 * The former symbol's order of colors seems to represent the location of the gem in the body of its owner: both Blue and Yellow Diamond have their gem in their chests, so they are equal in position in the middle row, whereas White Diamond has her gem in her forehead and Pink Diamond has it in the lowest position in her navel, hence in the symbol White Diamond is on the top and Pink Diamond is on the bottom.
 * It also reflects the size of the Diamonds, as White Diamond is the largest, Pink Diamond is the smallest, and both Yellow and Blue Diamond are equal in size.
 * The Great Diamond Authority is yet another of Ronaldo's paranormal theories that have been proven to be true.
 * He began to develop his theory in the first season episode "Keep Beach City Weird", warning of the Great Diamond Authority. Peridot confirmed the matriarchs' collective name in the episode "It Could've Been Great".
 * It is revealed in "Monster Reunion" that the Diamonds were the ones responsible for the corruption of almost all remaining Gems on Earth.
 * Nephrite drew the original Great Diamond Authority symbol without the lowermost diamond when she was asked who or what caused the damage to her and the other Corrupted Gems, implying Pink Diamond was not involved with this attack. This is confirmed in "Your Mother and Mine".
 * The circles placed behind the heads of the Diamonds in their murals resemble halos, a common motif in the sacred art of Ancient Greece, Ancient Rome, Hinduism, Buddhism, Islam, and Christianity. Combined with the epithets the prosecuting Zircon uses for Yellow Diamond, it appears light is extremely relevant in their iconography.
 * Although Gems usually serve under a specific diamond, Blue and Yellow Diamond seem to have the same amount of authority over each other's subordinates. For example, Yellow Diamond tells Holly Blue to "Get to the point!" in "That Will Be All", and she poofs Blue Diamond's defending Zircon in "The Trial". Additionally, Emerald's uniform shows both Yellow and Blue Diamond insignias in "Lars of the Stars".
 * Each of the Diamonds' personalities falls under one of the four fundamental personality types as established by the Ancient Greek Four Temperament Theory.
 * White Diamond is phlegmatic, as those that fall under this personality type tend to conceal their emotions.
 * Blue Diamond is melancholic, as she is highly emotional.
 * Yellow Diamond is choleric, as she, like those that fall under this personality type, is independent, goal-oriented, decisive, and acts on facts rather than emotions.
 * Pink Diamond is sanguine, as she is extroverted, tends to engage in a risk-seeking behavior, and is outgoing.
 * In the recent "Battle Of Heart And Mind" The Steven Universe Podcast, it's stated that White Diamond has a motherly role among the Diamonds and serves as a mother figure to the other ones.
 * It's also stated in the podcast that The Diamonds metaphorically represent a "body", White Diamond being the super-ego, Yellow and Blue Diamond being the ego, and Pink Diamond being the Id.

Gallery
La Gran Autoridad del Diamante Grande Autorité des Diamants Grande Ordine del Diamante Wielka Diamentowa Rada pt-br:A Grande Autoridade Diamante Autoritatea Diamantelor Высшая власть Алмазов Büyük Elmas Otoritesi Các Kim Cương