>>15407753 (PB)
Black Diamond is coal. "Black Diamon' story is cult coms
Try taking a 'black diamond,' ie coal or carbonado, to a mall jeweler for appraisal - be sure to tell him it "probably came from space" to get the best price.
https://en.wikipedia.org/wiki/Carbonado
Possibly of Interest
True carbonado diamondites have only been recorded from Brazil and the Central African Republic (CAR). Considering South America & Africa were physically connected for a long time while a part of the ancient Gondwana continent, these two carbonado occurrences may ultimately represent one deposit.
COMPOSITION
Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon, with minor crystalline precipitates filling pores and occasional reduced metal inclusions