black_diamond

carbonado hematite
anthracite
carbonado, a natural diamond that is black in colour
A black synthetic diamond, specifically a CVD polycrystalline diamond or HPHT polycrystalline compact diamond.
boron carbide
puhekieltä A member of the new affluent black middle class in South Africa, characterised by conspicuous consumption.
puhekieltä A symbol representing a steep and relatively difficult trail, typically 40% gradient or above.