gemstone

Diamond (Faceted)

Carbon (C)

Hardness: 10 (Mohs scale); Color: Colorless to faint yellow; Luster: Adamantine (brilliant); Crystal Structure: Isometric-Hexoctahedral; Specific Gravity: 3.52.

Hardness: 10 (Mohs scale)
Color: Colorless to faint yellow
Luster: Adamantine (brilliant)

Identified July 6, 2026More gemstone →

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Physical properties

Hardness: 10 (Mohs scale); Color: Colorless to faint yellow; Luster: Adamantine (brilliant); Crystal Structure: Isometric-Hexoctahedral; Specific Gravity: 3.52.

Formation & geological history

Formed at high pressure and temperature in the Earth's mantle (150-250 km deep) billions of years ago. Transported to the surface by deep-origin volcanic eruptions called kimberlite pipes.

Uses & applications

Used primarily in fine jewelry (engagement rings), industrial cutting, grinding, and drilling tools due to extreme hardness, and high-end thermal management applications.

Geological facts

Diamonds are the hardest known natural substance. The Hope Diamond is one of the most famous examples. They are composed of a single element: Carbon.

Field identification & locations

Identify by its brilliance, ability to scratch any other material, and high thermal conductivity. Commonly found in secondary alluvial deposits or primary kimberlite pipes in Russia, Botswana, and Canada.