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This article is about Cluster Gems. You may be looking for The Cluster.

There is no helping them, they're too broken. The beings who used to be in those shards are so shattered, they don't know who they are or what's happening around them. They just seek out other Gems, looking for the missing pieces of themselves, trying to make themselves whole.

Peridot, "Gem Drill"

Cluster Gems, also known as Gem Mutants and Artificial Fusions, are forced fusions of former Gems. They were created by Homeworld Gems in the Prime Kindergarten to serve as prototypes for the real Cluster. When Cluster Gems sense other Gems, they become aggressive in an attempt to recover their gemstones' missing shards and become "whole" again. They first began emerging in "Keeping It Together". It is revealed in "Homeworld Bound" that these Gems can be healed if their shards are put back together and are combined with Yellow Diamond's reconstructive powers.


In general, Clusters take the form of various body parts and limbs joined to other appendages. The limbs are of mismatched colors, such as dark and light blue, rust, violet, olive green, mint gray, pale green and dull yellow, indicating that they originally belonged to different Gems. Clusters vary widely in appearance, ranging from disembodied sets of conjoined limbs to humanoid creatures of varying symmetry. More extreme variants take the forms of multi-limbed creatures and gruesome, amorphous masses of limbs.


A total of 27 Cluster Gems have been seen thus far.

Image Description Appearance(s)
A cluster that consists of a dull purple and royal blue arm fused together. "Keeping It Together"
Referred to as "Mini Cluster Gem" in the model sheets, this cluster consists of a blue hand and a dull plum foot fused together.
Referred to as "Hand Hand" in the model sheets,[1] this cluster consists of an indigo and light green hand fused together.
Cluster Hand Monster.png
Referred to as "Hand Cluster" and "Hand Cluster Gem" in the model sheets,[1] this giant variant of a cluster appears to be comprised entirely of limbs conjoined together in a single hand-and-forearm-shaped body, wrapped in what looks like a dark gray cloth. At its core, the fusion is comprised of four different shattered Gem Shards that are physically fused together. It possesses four large eyes. Its irises and visible Gem Shards are green, yellow, blue and purple. According to Garnet, the four Gems were the shattered fragments of shattered Crystal Gems.
Cluster 4.png
A cluster that consists of a light green and dull plum foot fused together.
Referred to as "Arm Leg" in the model sheets,[1] this cluster consists of a cool yellow leg and a light green arm fused together.
Cluster 5.png
A cluster that consists of a gray arm with a dull plum and sky blue hand fused together.
Bed Cluster by Lenhi.png
Referred to as "Patient 1" in the Nightmare Hospital episode credits,[2] and as the "Bed Mutant" in its model sheet. This cluster has six arms and two legs. It takes a more human form. However, two arms take the place of where a head would be and has two arms sticking out of its right side. Its right leg also ends with a mismatched lower leg that is much smaller than the part above, loosely resembling a digitrade limb configuration. The limbs are in various colors such as orange, teal, gray, blue, and a dull purple. The location of its gem is unknown, assuming it is visible. "Nightmare Hospital"
Hallway Cluster By King.png
Referred to as "Patient 2" in the "Nightmare Hospital" episode credits,[2] and as the "Hallway Mutant" in its model sheet. This cluster has three arms and two legs. It has two large tumorous-like growths where its face would be. Its left arm acts as a leg and is very long, huge and muscular. Attached to it is two parallel hands. It has two right arms. One of its legs is very small, not allowing it to act as a real leg. It comes in many mismatched colors, including yellow, spring green and dull purple. The cluster with the same appearance made a cameo in "Earthlings", which was not explained since the "Hallway Mutant" was bubbled, and most Cluster Gems are unique.
Referred to as "Mouth Leg Mutant" in the model sheet, a cluster that has 6 feet but uses 4 of them as arms. Two of the feet are dark purple, and the rest of its body is dull red. On the bottom, it has a fang-lined vertical mouth that opens to reveal a single eye attached to a retractable optic nerve. It also has a dull yellow arm as a tail. "When It Rains"
Cluster - Pé - Mão.png
Another cluster with a cool gray hand, wrist, and a very light red foot, but it appears to be bigger.
Referred to as "Mouth Torso Mutant" on the model sheet. A dull blue cluster with two legs, a round torso body, and dull purple arms. It has a large mouth on its torso.
A cluster with a red leg, a light yellow leg, a red round body, and a large coral arm.
Referred to as "Hand Body Mutant" in the model sheet. A humanoid cluster with a red head with a single blue eye and a dull yellow hand like body with three folded "finger arms" at the back.
A giant white-beige hand. The bottom is not seen, but it can walk, and appears to have two humanoid legs. Unlike other clusters, this one appears to be completely monochromatic, with no jagged, discolored segments visible.
Referred to as "Arm Eye Mutant" in the model sheet. A big cluster with a plum round body, a pair of dull blue feet, a dull blue hand on top and a dull red eye in the center with a light red sclera. 
A big hand cluster that is half dull red and half dull plum. 
A small cluster with a dull blue arm and a dull red leg.
A big green and light blue cluster with three dull green fingers, four light blue fingers, and a light blue foot.
Referred to as "Foot Arm Mutant" in the model sheet, a cluster with a light green head, a light blue body and left arm, a giant dark green foot as its right arm, and full purple lower body. Unlike other mutants, it has a discernable facial struture, with a single eye and a wide mouth with constantly baring teeth.
A bright red hand with a red-orange foot coming out of it. "Gem Drill"
A slightly humanoid cluster with three tumorous growths surrounding its gem, thus resembling a poppy, which is a kind of flower. It has eight limbs, with six legs and two arms.
Two arms stuck together, being deep red and red-orange.
Two legs stuck together, being bright orange.
Earthlings Cluster Gems Finished.png
The cluster Jasper was holding captive in Earthlings, it broke out and had not been seen since. It is similar to one of the cluster Gems seen in "Nightmare Hospital" "Earthlings"
One dull blue and dark teal arm and a dark purple and light purple arm stuck together. "The Phantom Fable" (Level 2 Canon)
A dull brown leg and a dull red and light orange arm stuck together.



When the Earth was no longer fit to be a Gem colony, Yellow Diamond decided to create the Cluster. Because the Cluster project was a hefty task, Yellow Diamond and other Homeworld Gems decided to create prototypes. They took the shattered remains of Crystal Gems from the Rebellion and forced their Gem Shards to fuse together through an unknown process. It has resulted in a new gemstone that holds the consciousness of the Gems fused with it. When this artificial Gem projects its physical form, they appear to be distorted monsters as they are composed of shards of former Gems, only pieces. These prototypes were left in the Prime Kindergarten Control Room, where they stayed dormant for thousands of years.

"Marble Madness"

The containers in which the Clusters are kept descends from the control room ceiling.

The Cluster Gems' containers make a semi-hidden cameo when Peridot is accessing the Facet Five control room.

"Keeping It Together"

Other fused Gem Shards falling from mysterious columns.

Steven and Garnet encounter Cluster Gems in the Kindergarten, the Hand Cluster, and six smaller Cluster Gems. The appearance of the Clusters is so horrifying to Garnet that she becomes unstable to the point where she almost un-fuses. Ruby, through Garnet, states she believes the Cluster Gems were created as punishment by Homeworld for The Rebellion. The Cluster Gems are eventually "poofed" by Garnet and currently reside within one of her bubbles in the Burning Room.

"Nightmare Hospital"

Two Clusters are sighted across roads and taken to Dr. Maheswaran's workplace, mistaken as victims of car accidents and treated by doctors at the Hospital. Later, they break into the halls and try to attack Steven, Connie and Dr. Maheswaran, only to be poofed by Connie with Rose's Sword and then bubbled by Steven.

"When It Rains"

Peridot and Steven are assaulted by several of them when attempting to escape the Kindergarten before Steven forms a bubble and the Crystal Gems rescue them. This is the second time where the Cluster Gems are shown to have facial features (i.e., mouth, eyes); the first time being "Keeping it Together".

"Gem Drill"

Steven and Peridot are attacked by some prototypes while drilling to the earth's core to stop the Cluster, which is blasted back into the magma.


A Cluster Gem that looks similar to the bulky one from "Nightmare Hospital", was captured by Jasper and caged in the Beta Kindergarten, but managed to escape with a few Corrupted Gems during Jasper's battle against Smoky Quartz.

"Change Your Mind"

As Blue Diamond with Steven and Connie enters Yellow Diamond's Bubble Chamber to rescue Garnet (Ruby and Sapphire), Amethyst, and Pearl where all of the bubbled Cluster Gemstones on these walls.

"Homeworld Bound"

Various Cluster Gemstones are being separated and repaired by Yellow Diamond.

Episode Appearances


Hand Cluster members attempting to escape the fusion.

Hand Cluster's four eyes.

The frame where the Hand Cluster gem changes to Nephrite's gem; confirmed by Matt Burnett to be an animation error.

  • Coincidentally or not, if one excludes Hand Cluster's thumb (which is covered by a boot), it has a glove covering every finger but the middle, while Garnet has a glove covering her middle finger.
  • The blue "leg" off to the left of the Hand Cluster appears to have the same boots as Amethyst and Ruby.
  • There appears to be no red Gem Shard in the Hand Cluster, despite the red leg and arm present in it. This may be due to the fact that it is technically a cross-gem fusion, which often have colors that differ from those of its component gems. This may also be because one of the shards is a piece of a multicolored Gem, making it likely that she was part red in color but it is not visible in the shards.
  • The silhouettes of the Hand Cluster members have traits similar to other Gems on the show. For example, their hairstyles are similar in appearance to that of Pearl's haircut from the Pilot.
  • When the Hand Cluster's gem was sent to the Burning Room, its gem reshaped itself to appear like Nephrite's gem.
    • This was later confirmed to be an animation error by Matt Burnett via his Twitter.[3]
  • Each of the Hand Cluster's eyes has a defined plica semilunaris on either side of it, not seen elsewhere on eyes in the show.
  • In "Nightmare Hospital", it is mentioned that they have no vitals or heartbeat, a fact that may also pertain to regular Gems as well, given their fluid physiology.
  • In the episode "When it Rains" two Cluster Gems with actual heads, mouth and eyes are among the group attacking Steven and Peridot.
    • This episode introduced the most Cluster gems to date, with 11, while "Earthlings" introduced only one.

Cultural References

  • Clusters share many similarities to Frankenstein's Monster from the famous film adaptation of Mary Shelley's novel of the same name. Cluster Gems, however, are more classified as half-aliens, and half-flesh golems. Concerning physiology, Flesh Golems are grotesque patchworks that are made out of flesh, which fits the Cluster Gems rather closely.
    • Both are made out of body parts of different deceased individuals, acquired via grave robbing.
    • They are unnatural creations which were created through scientific means.
    • Both are presented as tragic, yet horrifying figures.
  • The malformed appearances and multi-limbed forms of the Cluster Gems give them a striking resemblance to the Necromorphs from the Dead Space series. Their intent to 'make themselves whole' also mirrors a tag-line from the game.
    • Their grotesque amalgamations of body parts also bear a resemblance to John Carpenter's The Thing, as well as its 2011 prequel, which does show arm-based creatures.
  • The two-headed Cluster Gem resembles the Charger in the Left for Dead video game series regarding anatomical design.
  • The Hand Cluster's cloth makes it resemble a Mummy.
  • The rock cylinders used to hold the immature Cluster Gems resemble rock core samples.
  • The style of the Hand Cluster's eyes resembles the eyes of Matarael and Sachiel from Neon Genesis Evangelion.


  • A cluster of gemstones is a result of gems that fuse together due to extensive pressure from being underground. In most cases clusters are usually fusions of the same gemstone; however, in sporadic cases, it is possible for clusters to form from different gemstones.


Image Description
Multi-gem freakin' gemstone.png
The Hand Cluster's gemstone is a mix of four different gems joined into a single gemstone. It's located on the center of its "palm".
A smaller cluster taking the form of a hand and a foot has two Gem shards fused together into a V-shape, with smaller pieces stuck around the joint. One is blue, and the other is purple. The shards are internal.
Bed Cluster Gem.png
The gemstone of Patient 1 – three shards fused at one point. One is teal, the other red, and the other gray.
Hallway Cluster Gem By King.png
The gemstone of Patient 2. A large purple squarish shard, with small yellow and blue shards attached.
Cluster - Pedra - Media.png
The gemstone of the cluster with a light green head that has one eye and mouth on its face, a light blue body and left hand, a big green foot as its right hand, and purple lower body.
The gemstone of the big white hand cluster.
The gemstone of the blue hand with seven fingers and a foot cluster.
The gemstone of the cluster with a round violet body, three blue limbs, and an eye.
The gemstone of the small cluster with a blue hand and red leg.
The gemstone of the cluster with a big blue hand and pink foot.
The gem of the cluster with three tumors.
The gemstone of purple-navy blue arms cluster (Level 2 Canon).
The gemstone of orange arm-brown foots cluster (Level 2 Canon).


Click to view the gallery for Cluster Gems.


  1. 1.0 1.1 1.2
  2. 2.0 2.1 Nightmare Hospital
  3. Q: "why did the gem cluster morph into what looked like centipeetle's gem????" A: "Really hate to disappoint you with this answer, but it's important to clear it up: it's an animation error".
ve Fusion Gems
Crystal Gem Fusions

Full-Gem Fusions
FusionTemplateGarnet3.png FusionTemplateOpalMovie.png FusionTemplateSugilite.png FusionTemplateSardonyx.png
FusionTemplateAlexandrite.pngFusionTemplateRainbowQuartz.png Newobsideon.png NavboxCrazyLaceFixed.png

Hybrid Fusions

FusionTemplateStevonnie.png FusionTemplateSmokyQuartz.png Rainbow Quartz 2.0 Gem Nav.png Sunstone Thumbnail fixed.png FusionTemplateObsidianS.png Steg Nav.png

Homeworld Gem Fusions

FusionTemplateMalachite.png Ruby quintuple fusion gem.png FusionTemplateJasperMonster.png
FusionTemplateTopaz.png JadeFusionNavbox.png BluebirdAzuriteNavbox.png

Crystal Gem/Homeworld Gem Fusions


Unaligned Gem Fusions

RhodLink.png FluoriteLink1.png

Forced Fusions

FusionTemplateCluster.png Cluster Navbox.png

ve Characters in Steven Universe
Crystal Gems Human-Gem Hybrids: Steven Universe

Unfused Gems: AmethystBiggs JasperBismuthLapis LazuliLarimarPearlPeridotRubySapphireSnowflake Obsidian
Fusion Gems: AlexandriteCrazy Lace AgateGarnetMega PearlObsidian (Rose Quartz Fusion)OpalRainbow QuartzSardonyxSugilite
Hybrid Fusions: Obsidian (Steven fusion)Rainbow Quartz 2.0Smoky QuartzStegStevonnieSunstone
Inactive Gems: Rose Quartz
Humans: Connie Maheswaran
Pets: LionPumpkinCat Steven

Homeworld Gems Unfused Gems: CombyEmeraldPebblesPeridotsSapphiresSpinel

Fusion Gems: MalachiteTopazZebra Jasper (fusion)Giant RubyRuby (triple fusion)Lemon JadeBluebird Azurite
Inactive Gems: Pink Diamond

Off Colors Unfused Gems: PadparadschaRutile Twins

Fusion Gems: FluoriteRhodonite
Humans: Lars Barriga

Other Gems (Formerly) Corrupted Gems: AlbiteAngel Aura QuartzBig Bird • Biggs Jasper • BixbiteBlue ChalcedonyBlue Lace Agate • Cherry Quartz • ChrysocollaDesert GlassEarth BeetleGrossular DiopsideHeaven Beetle • Jasper • Lace Amethyst • Larimar • Moonstone • Nephrite • Ocean JasperOrange Spodumene • Snowflake Obsidian • Tongue MonsterUnknown Giant Gem MonsterWater BearWatermelon TourmalineWhite TopazZebra Jasper (singular)Minor Corrupted Gems

Other Gems: Minor GemsUnknown Gems (Morganite • Nephrite-XJ Cut-763 • Unknown Quartz Warrior • Blue Diamond's Court • Pink Diamond's EntourageUnknown Crystal Gems67 Elite CitrinesPyritesHessonites, Demantoids, and PyropesKyanites)

Forced Fusions: Cluster Gems (The Cluster)

Comic Gems: Ant Gem MonsterClock Tower GemFrozen FragmentGlass GhostInvisible Manta RayMole Gem MonsterMolluskMonster Lizard GemObeliskOld Book GemPlant MonsterPerils of PweepweeRainbow Cloud MonsterRed Bird Gem MonsterRed Eel MonsterScorching ShardSlime Gem MonsterSlug MonsterSnowbeastTentacle MonsterUnknown Giant BirdVine Monsters

Other Major Characters Humans: Greg UniverseSadie Miller
Recurring Characters Humans: Andy DeMayoBarbara MillerBill DeweyBuck DeweyBuddy BuddwickDante and Martha BarrigaDoug MaheswaranPriyanka MaheswaranHarold SmileyJamieJaneJenny PizzaKevinKiki PizzaKofi PizzaMartyMr. FrymanMystery GirlNanefua PizzaOnionPeedee FrymanQuentin FrowneyRonaldo FrymanShepSour CreamSuitcase SamVidaliaYellowtailZoomans (F-3Jay-TenU-12Wy-Six)

Other: Baby MelonBlue CrabsCactus StevenHolo-PearlMagic MossSteven Jr.Watermelon Stevens

Minor Characters Humans: The Best Diner in the World's WaitressEmpire City Wildlife Rehabilitation Center EmployeeGaryGreg's family (Aunt and Uncle • Aunt DebGrandfatherParentsGreat-aunt Gregargia) • Hospital Employees (Dr. GeroDr. StrombergDr. West) JeffKhajima, Jaime, and BrandishMarty's RoadiesMayoral BodyguardsMike KrolOnion's Friends (Garbanzo • Pinto • Soup • Squash) • Patricia and DanielRickySabinaSteven's BabysitterSunshine JusticeWilliam Buford BuchananWilliam DeweyMinor Human Characters

Animals: Butt LobsterCrystal BasiliskDogMask Island FishOnion's MouseOnion's SnakeParty GuyRaccoonSeagullsSnakeSteven The ThirdSusanMinor Animal Characters
Aliens: Beetle AliensBird Blob AliensUngulate AliensWorm AliensFlower-Like AliensMinor Alien Characters

Fictional Characters Cookie CatDogcopterMearlPizza JennyMinor Fictional Characters

Camp Pining Hearts: PaulettePercyPierre
"Garnet's Universe": FoxmanHopperHoppyRingo
Golf Quest Mini: AceAce's Father
Li'l Butler: Li'l ButlerMr. MoneyMrs. MoneyDaughter Money • Dirtbike Money
Lonely Blade: Evil JanitorLonely BladeLonely Blade's Brother
Rose's Room: Cloud ConnieTiny Floating Whale
The Spirit Morph Saga: ArchimicarusLisaPlinkmanWind Lizard

Antagonists CentipeetlesCrab MonstersCrystal ShrimpDrill ParasitesElectric SkullsFryboRed EyeRobot Shooty ThingSmoke Monster
Alter Egos Billy Bank AssetsChunk TruckConcrete HeatDashing Danny DooberHandsome Hank HackleschmidtHowl JonesLoch Ness BloggsterPurple PumaSea WaspShark-O-ManiaTiger Millionaire
Attack the Light Blue LightGreen LightIndigo LightOrange LightRed LightViolet LightWhite LightYellow Light

Groups: Light ArmyBlue Monsters • Green Monsters • Indigo MonstersOrange MonstersRed Monsters

Save the Light Hessonite • SquaridotHessonite's Citrines
Unleash the Light DemantoidPyrope
The Phantom Fable Fable • Lonely PearlJasper (Eyeball)
Groups The Cool Kids • Crystal Gems • Crystal Temps • "Famethyst" • The Great Diamond Authority • Homeworld Gems • Off Colors • Pebbles • Sadie Killer and the SuspectsSecret Team • Steven and the Stevens • Water ClonesZoomansSpecies
Gem Types Aquamarines • BismuthsDiamonds • GarnetsJades • Lapis Lazulis • Nephrites • Pearls • Pebbles • Peridots • Quartzes • Rubies • Sapphires • Topazes