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Those properties determine the major industrial application of diamond in cutting and polishing tools and the scientific applications in diamond knives and diamond anvil cells.

Because of its extremely rigid lattice, it can be contaminated by very few types of impurities, such as boron and nitrogen.

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.

These depths are estimated between 140 and 190 kilometers (87 and 118 mi) though occasionally diamonds have crystallized at depths about 300 km (190 mi).

The rate at which temperature changes with increasing depth into the Earth varies greatly in different parts of the Earth.

During eruption these pipes are open to the surface, resulting in open circulation; many xenoliths of surface rock and even wood and fossils are found in volcanic pipes.

Diamond-bearing volcanic pipes are closely related to the oldest, coolest regions of continental crust (cratons).

The dispersion of white light into spectral colors is the primary gemological characteristic of gem diamonds.) 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.Diamond is less stable than graphite, but the conversion rate from diamond to graphite is negligible at standard conditions.Most natural diamonds are formed at high temperature and pressure at depths of 140 to 190 kilometers (87 to 118 mi) in the Earth's mantle.Carbon-containing minerals provide the carbon source, and the growth occurs over periods from 1 billion to 3.3 billion years (25% to 75% of the age of the Earth).This is because cratons are very thick, and their lithospheric mantle extends to great enough depth that diamonds are stable.