The luster of a diamond depends if it is cut or not. When uncut the luster is greasy and when cut the luster wold be adamantine.
The hardness on the Mohs Hardness Scale is rated a 10. The absolute hardness is a 1600.
Usually yellow, brown, gray to colorless. Less often blue, green, black, or translucent white, pink, violet, orange, purple .
This mineral tends to be clear or very light which therefore results in no streak.
the crystal from of a diamond is isometric and hexoctahedral
The cleavage for a diamond is perfect octahedra.
The fracture of a diamond is irregular and uneven.