An allotropic form of the element carbon with cubic structure (space group \(O_{h}^{7}- Fd3m\)) which is thermodynamically stable at pressures above \(6\ \rm{GPa}\) at room temperature and metastable at atmospheric pressure. At low pressures diamond converts rapidly to graphite at temperatures above \(1900\ \rm{K}\) in an inert atmosphere. The chemical bonding between the carbon atoms is covalent with \(\mathrm{sp}^{3}\) hybridization.