Homeworld Gems

Homeworld Gems is a term used by the cast, crew, and viewers to refer to the known, non-corrupted Gems who are or have been affiliated with the Gem Homeworld and are not members of the Crystal Gems.They are led by the matriarchal body of The Great Diamond Authority, who are in absolute power of the existing Gem colonies.

Yellow Diamond
In "Hit the Diamond", Peridot reveals that Yellow Diamond is in complete control of Homeworld's military. All her subordinates (except her Pearl, Doc, and Navy) have a small Yellow Diamond on their chests in two symmetrically connecting diagonal black lines. She created The Cluster project when Earth was deemed unfit for a colony, due to the Rebellion. She is the supervisor and superior of Jasper, and formerly Peridot.

Blue Diamond
Not much is known about her, except for the fact that she is a high-ranking authority figure, because she is part of The Great Diamond Authority. She was once the supervisor of the colonization of Earth, after Pink Diamond was shattered by Rose Quartz. Sapphire was a former member of her court.

Pink Diamond
Not much is known about her, other than the fact that she was in charge of the Earth colony, and that her symbol is present on the majority of ancient Gem structures. Her symbol is absent on structures dating as early as the Pyramid Temple though, as she was shattered by Rose Quartz, one of her former court members, at some point during the Rebellion. Jasper was originally assigned to her as well. She also has a mural in the moon base, along with all the other diamonds. She is not present in the recent symbol for The Great Diamond Authority.

Jasper
A Quartz soldier assigned to escort Peridot on her mission to Earth who participated in the first war for Earth. After attempting to build an army of Corrupted Gems to fight the Crystal Gems, she was defeated by Smoky Quartz, became corrupted, and was eventually poofed and bubbled.

Unnamed Warrior Gem ("Sworn to the Sword")
An unknown Gem is seen fighting Rose Quartz and Pearl during the rebellion. Current status is unknown.

Blue Diamond's Pearl
A Pearl who serves Blue Diamond. This Pearl seems to very calm and somewhat apprehensive to her owner. Blue Diamond's Pearl also acts mostly indifferent to her surroundings. She is rather opposite of Yellow Pearl.

Yellow Diamond's Pearl
A Pearl who serves Yellow Diamond. She is arrogant and somewhat sassy, though she is only fearful of her master Yellow Diamond.

Unknown White Diamond
In the logo of The Great Diamond Authority, a white diamond can be seen as well as the mural depicting her. Not much is known about her or her status. She appears to have spiky hair and her gemstone is placed on her forehead. According to her mural she had the most Colonies when the Moon Base was built, it is unknown how many she has now.

Former Members

 * Crystal Gems
 * Rose Quartz
 * Pearl
 * Ruby
 * Sapphire
 * Peridot
 * Bismuth
 * Lapis Lazuli
 * Pink Diamond

History
Over 5,750 years ago, the Homeworld Gems arrived on Earth using the Gem Colony Ships and soon after, they built the Warp Pads for faster and easier traveling. During the time they had on Earth, they planned to terraform and colonize the planet, creating the Kindergarten in order to produce more Gems at the cost of depleting the Earth of its resources which would inevitably cause great harm to the planet and its inhabitants.

Feeling compassion and seeing the error in their ways, Rose Quartz rebelled and formed the Crystal Gems, a team of rebels who also wanted to protect the earth, and they started the war for Earth known as The Rebellion. Both sides fought valiantly against each other, but the battle that took place on the Gem Battlefield, resulted in the Crystal Gem's victory, driving the remaining Homeworld Gems to retreat back to Homeworld, including Jasper. However, the Great Diamond authority utilized a weapon that would result in the corruption of many Crystal Gems fighting on Earth and marked the end of the Rebellion, ensuring that Homeworld would never be threatened. Many Gems were destroyed or corrupted, reducing the original group of Crystal Gems (who originated on Homeworld) to Rose Quartz, Garnet, and Pearl.

The first member of the Homeworld Gems to be seen many years after the war was Lapis Lazuli, who had been trapped for thousands of years inside a mirror before Steven freed her. He healed her and she returned to Homeworld, only to regret it soon after as Homeworld had advanced so much in the time that she was trapped in the mirror and had found herself out of place. She was soon captured and forced to be the informant in the mission to check the Cluster along with a team of Homeworld Gems.

The second member of the Homeworld Gems to be seen was Peridot, who repaired the Homeworld warp at the Galaxy Warp. She was to check on the current status of the Cluster, but left after finding a Crying Breakfast Friends! sticker, which made her think the site was compromised.

She returned in "Marble Madness", where she tried to check on the Kindergarten again before Steven distracted her, which prompted her to attempt to kill him. However, the remaining Crystal Gems intervened and destroyed the main power source of the Prime Kindergarten Control Room, which made Peridot tell them that she would report what had happened.

Lapis was seen again in "The Message", this time using a Wailing Stone in Homeworld to send a message to Steven and the Crystal Gems of an approaching threat coming to Earth. Unbeknownst to them, Lapis had already been forced to be the informant of the threat.

During the events of "The Return", Peridot brought with her two Homeworld Gems: her escort Jasper, and her informant Lapis Lazuli, traveling to Earth on the Gem Warship. Jasper helped Peridot defeat the Crystal Gems and take them back to the Homeworld. However, their plans were foiled when the Crystal Gems managed to fight back and defeat them, crashing their Warship in the process and stranding Peridot somewhere on Earth after she escaped on an escape pod. In one last ditch effort to defeat them, Jasper fused with Lapis to become Malachite, a monstrous fusion who sealed herself in the ocean by Lapis' will.

Peridot's primary mission for coming to Earth was seen in "Keeping it Together". She had on various occasions throughout her appearances, been shown to be checking up on the cluster. In the aforementioned episode, the Cluster is revealed to be the result of fusion experiments done by the Homeworld Gems. The Homeworld Gems had taken the shards of fallen Crystal Gems from the war and experimented on them, forcibly fusing the shards to create it.

Trivia

 * Many fans have nicknamed the leader(s) the "Great Diamond Authority" based on Ronaldo's conspiracy theory created in "Keep Beach City Weird". Later, "It Could've Been Great" confirmed this theory.
 * Gems in alignment with Homeworld have diamond symbols on their outfits and weapons as opposed to the stars on the Crystal Gems' outfits and weapons. (Seen in Guide to The Crystal Gems)
 * In the episode "Bismuth", Bismuth mentions a Gem known as "Nephrite" piloting a Homeworld ship.
 * Nephrite gemstones are smooth, green gemstones that are classified as jade.