mineral

Diamond

Carbon (C)

Hardness: 10 (Mohs scale), Color: Colorless to faint yellow/brown (in this specimen), Luster: Adamantine, Crystal Structure: Isometric-hexoctahedral, Cleavage: Octahedral, Specific Gravity: 3.52

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 10 (Mohs scale), Color: Colorless to faint yellow/brown (in this specimen), Luster: Adamantine, Crystal Structure: Isometric-hexoctahedral, Cleavage: Octahedral, Specific Gravity: 3.52

Formation & geological history

Formed under high-pressure, high-temperature conditions in the Earth's mantle, typically at depths of 150-250 kilometers. Transported to the surface by kimberlite or lamproite volcanic eruptions.

Uses & applications

Primary use in jewelry as a gemstone; also used extensively in industrial cutting, grinding, and drilling tools due to its extreme hardness.

Geological facts

Diamond is the hardest known natural substance. The specimen in the image appears to be a small single-cut or brilliant-cut diamond inset into a metallic band (likely gold or silver).

Field identification & locations

Identification includes testing for high thermal conductivity and dispersion. In the field, diamonds are often recovered from alluvial deposits or primary kimberlite pipes. Collectors look for clarity, cut, color, and carat weight.