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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.
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]
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]
Snowfall director Damian Marcano wanted to show another side of strippers-turned-assassins Black Diamond and Dallas, so he explored them through motherhood. The end result was an awkward-but ...
There should be a separate article on black diamonds. Not every black diamond is a carbonado. Boart is also a black diamond. Most gemstones that are sold today are actually near-white diamonds that are irradiated to alter the color. Probably also worth mentioning that hematite was once marketed as "black diamond." Apparently that's no longer ...
The Black Orlov is a black diamond, also known as the Eye of Brahma Diamond. It weighs 67.50 carats (13.500 g). [ 1 ] The diamond—originally 195 carats (39.0 g)—is said to have been stolen in the early 19th century in India.