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Oh, man! Diamondhead and Grey Matter? I'm a razor-sharp hood ornament.

– Ben after turning into Diamond Matter.

Diamond Matter is the combination of Diamondhead and Grey Matter's DNA. He cannot be accessed unless the faceplate of the Omnitrix is broken or by using the Biomnitrix.[note 1]


Diamond Matter is slightly bigger than Grey Matter. He has Diamondhead's crystalline skin, as well as the spikes on his back and head, and Grey Matter's eyes and mouth.

Diamond Matter wore a uniform that was white with black cuffs on the left and black with white cuffs on the right, and wore the Omnitrix symbol on his chest.

Powers and Abilities

Being part-Petrosapien, Diamond Matter can alter the shape of his limbs and fire diamond shard projectiles much like Diamondhead.

Being part-Galvan, Diamond Matter's intelligence is at the same level of Grey Matter, allowing him to fire his diamond shard projectiles with excellent precision.


Unlike Diamondhead, Diamond Matter's enhanced strength is reduced to a level similar to Grey Matter because of his size.


Ben 10

  • Diamond Matter first appeared in Dr. Animo and the Mutant Ray, where he battled Heatbat and briefly got eaten, then thrown up by an alligator. He then sliced his way through some swamp trees to clear the gang's airboat's path until he reverted.


Ben 10

Season 2

Naming and Translations

Language Name Origin
Polish Szary Diament From szary, grey and diament, diamond
Portuguese (Br) Diamante Cinzento From diamante, diamond and cinzento, grey
Romanian Cap de Cerebel Head of Cerebellum
Russian Алмаз и Гуманоид From алмаз, diamond and и and, гуманоид, humanoid
Spanish (HA) Diamante Gris From gris, grey; and diamante, diamond


  • Diamond Matter's voice is similar to Diamondhead's in the original series but higher-pitched.


  1. Diamond Matter, Heat Jaws, and Stink Arms are three fusions which were originally created by a broken, prototype Omnitrix. All three fusions are possible with the Biomnitrix, however, they might differ in aspects such as appearance, powers and weaknesses due to the fact that there's no evidence to support the idea that the broken prototype Omnitrix creates fusions the same way as the Biomnitrix.
Introduced in Ben 10 ArctiguanaBlitzwolferBuzzshockCannonboltDiamondheadDittoEye GuyFour ArmsFrankenstrikeGhostfreakGrey MatterHeatblastRipjawsSnare-ohSpitterStinkflyUpchuckUpgradeWay BigWildmuttWildvineXLR8
Introduced in Alien Force Alien XBig ChillBrainstormChromastoneEcho EchoGoopHumungousaurJetrayLodestarNanomechRathSpidermonkeySwampfire
Introduced in Ultimate Alien AmpfibianArmodrilloChamalienClockworkEatleFasttrackJuryriggNRGShocksquatchTerraspinWater Hazard
Introduced in Omniverse AstrodactylAtomixBall WeevilBloxxBullfragCrashhopperFeedbackGravattackGutrotKickin HawkMole-StachePesky DustThe WorstToepickWalkatroutWhampire
Future Aliens SandboxShellheadSnakepit
Ultimate Aliens AlbedoArctiguanaBig ChillCannonboltEcho EchoGravattackHumungousaurRathSpidermonkeySwampfireWay BigWildmutt
Fusion Aliens Atomic-XBig ChuckCrashockerDiamond MatterFourmungousaurHeat JawsHumungoopsaurStink ArmsUprigg
Concept Fusion Aliens GravadactylXLRG
Other Aliens in Official Media AntigraviteslaBob the BlobCartoon Network AlienEon (Retconned)MoyoInvinciblePlantapocalypsePortalerRocksShadowmanSquidstrictorStretcheleo