black diamond

noun7

1. •
   A symbol representing a steep and relatively difficult trail, typically of a 40% gradient or above.
2. •
   Carbonado, a natural diamond that is black in color.
3. •
   A black synthetic diamond, specifically a CVD polycrystalline diamond or HPHT polycrystalline compact diamond.
4. •
   (South-Africa, offensive) A member of the new affluent black middle class in South Africa, characterized by conspicuous consumption.
5. •
   Anthracite.
6. •
   Hematite.
7. •
   Boron carbide.