|Species|| 1/2 Petrosapien
|Powers and Abilities|
|Abilities|| Crystal Manipulation|
|Voice Actor||Jim Ward|
|First Appearance||Dr. Animo and the Mutant Ray|
Diamond Matter is around the size of Grey Matter. He also has Grey Matter's eyes and teeth but he has Diamondhead's crystalline skin and appearance. The Omnitrix is on his chest.
- Diamond Matter can alter the shape of his limbs and fire crystals like Diamondhead.
- Like Grey Matter, he is small and can fit into tight spaces and has enhanced intelligence.
- Dr. Animo and the Mutant Ray