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In particular, nanocrystalline diamond aggregates were measured to be harder than any large single crystal diamond.

Those aggregates are produced by high-pressure high-temperature treatment of graphite or fullerite (C The hardness of diamond contributes to its suitability as a gemstone.

By demonstrating that burning diamond and graphite (charcoal) releases the same amount of gas he established the chemical equivalence of these substances.Diamond is the hardest natural material known, where hardness is defined as resistance to scratching and is graded between 1 (softest) and 10 (hardest) using the Mohs scale of mineral hardness.Diamond has a hardness of 10 (hardest) on this scale.Excellent optical and mechanical properties, combined with efficient marketing, make diamond the most popular gemstone.Most natural diamonds are formed at high-pressure high-temperature conditions existing at depths of 140 to 190 kilometers (87 to 120 mi) in the Earth mantle.

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In mineralogy, diamond (from the ancient Greek αδάμας – adámas “unbreakable”) is an allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice.