carbonado
toughest form of natural diamond; it is an impure form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon
Sergio
Largest known rough diamond
Black Orlov
67.50-karat black diamond (originally 195 karats), discovered in the early 19th century in India; according to legend, originally one of the eyes in a statue of the Hindu god Brahma in Pondicherry and supposedly cursed since it was stolen
Amsterdam Diamond
6.748 g carbonado diamond, with 145 facets, in a pear shape, cut from a 11.17 g rough
The Enigma
black diamond