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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. [ 1 ]
The Sergio (Portuguese: Carbonado do Sérgio) was the largest carbonado and the largest rough diamond ever dug up on earth. [1] It weighed 3,167 carats (633.4 g; 20.36 ozt) and was found above ground in Lençóis (State of Bahia, Brazil) in 1895 by Sérgio Borges de Carvalho. Like other carbonados, it is believed to be of meteoritic origin.
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
Bort-like heavily twinned diamond from Congo. Bort is commonly used as an abrasive. Smaller flakes and particles are used as an additive for scouring or polishing pastes and agents. Larger particles can be added to cutting, drilling and grinding tools to improve their lifespan and substantially increase their efficiency. [4]
The Black Diamond, a 1921 British novel by Francis Brett Young; Black Diamond: The Story of the Negro Baseball Leagues, a 1994 book by Patricia and Fredrick McKissack; Black Diamonds: The Aboriginal and Islander Sports Hall of Fame, a 1996 book, incorporating the first round of the Aboriginal and Islander Sports Hall of Fame project
The Spirit of de Grisogono is the world's second-largest cut black diamond, behind the Enigma, and the world's sixth largest diamond overall. Starting at an uncut weight of 587 carats (117.4 g), it was taken from its origin in western Central African Republic to be bought and cut by Fawaz Gruosi. [1]