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DIAMOND is an allotropic form of the element carbon with cubic structure (space group O_h⁷‐Fd3m), which is thermodynamically stable at pressures above 6 GPa at room temperature and metastable at atmospheric pressure. At low pressures DIAMOND converts rapidly to GRAPHITE at temperatures above 1900 K in an inert atmosphere. The chemical bonding between the carbon atoms is covalent with sp³ hybridization.

See: CARBON, GRAPHITE.