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Diamond is renowned as a material with superlative physical qualities, most of which originate from the strong covalent bonding between its atoms.

In particular, diamond has the highest hardness and thermal conductivity of any bulk material.

In particular, under oceanic plates the temperature rises more quickly with depth, beyond the range required for diamond formation at the depth required.

The correct combination of temperature and pressure is only found in the thick, ancient, and stable parts of continental plates where regions of lithosphere known as cratons exist.

) is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.