gemstone

Diamond (faceted)

Carbon (C)

Hardness: 10 (Mohs scale), Color: Colorless (in this specimen), Luster: Adamantine, Crystal structure: Cubic, Cleavage: Octahedral, Specific gravity: 3.52

Identified July 6, 2026More gemstone →

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Physical properties

Hardness: 10 (Mohs scale), Color: Colorless (in this specimen), Luster: Adamantine, Crystal structure: Cubic, Cleavage: Octahedral, Specific gravity: 3.52

Formation & geological history

Formed under high-pressure, high-temperature conditions in the Earth's mantle, approximately 100 miles below the surface, and brought to the surface by kimberlite pipe eruptions.

Uses & applications

Predominantly used in jewelry as a gemstone and in various industrial applications for cutting, grinding, and drilling due to its extreme hardness.

Geological facts

Diamonds are the hardest known natural material on Earth and can be over 3 billion years old. The name comes from the Greek word 'adamas', meaning invincible.

Field identification & locations

Identification includes testing for high thermal conductivity and hardness. Found in locations like Russia, Botswana, Canada, and South Africa. For faceted gems, look for 'fire' (dispersion) and sharp facet edges.