As we all know, diamond is the hardest naturally-occuring mineral in our planet. The hardness of diamond is closely related to its carbon atoms arrangement. It is the allotrope of carbon where the carbon atoms are arranged in an isometric-hexoctahedral crystal lattice. Its hardness and high dispersion of light make it useful for industrial applications and jewelry.
49% of diamonds originate from central and southern Africa. Significant sources of this mineral have been also discovered in Canada, India, Russia, Brazil and Australia.
Regarding to the article linked above, The Spirit of de Grisogono is the world's largest cut black diamond and the world's fifth largest diamond overall. Starting at an uncut weight of 587 carats, it was taken from its origin in west central Africa and cut by Swiss jeweler De Grisogono. The resulting mogul-cut diamond weighs 312.24 carats and is set in a white gold ring with 702 smaller white diamonds totaling 36.69 carats. The ring is rumored to have been sold to an anonymous buyer for an undisclosed amount.
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