Diamond Matter is slightly bigger than Grey Matter. He had Diamondhead's crystalline skin. He also had Diamondhead's spikes on his back and the back of his head. He also had Grey Matter's eyes and mouth.
Diamond Matter had Diamondhead's crystallokinesis, able to alter the shape of his limbs and fire shards, but was only as strong as Grey Matter.
- It is unknown if Diamond Matter had Grey Matter's intellect.