black diamond

plural black diamonds

1. countableuncountableHematite.
2. countableuncountableAnthracite.
3. countableuncountableCarbonado, a natural diamond that is black in color.
4. countableuncountableA black synthetic diamond, specifically a CVD polycrystalline diamond or HPHT polycrystalline compact diamond.
5. countableuncountableBoron carbide.
6. South AfricacountablederogatoryuncountableA member of the new affluent black middle class in South Africa, characterized by conspicuous consumption.
7. countableuncountablehobbiesA symbol representing a steep and relatively difficult trail, typically of a 40% gradient or above.