gemstone

Diamond (Cut Gemstone)

Carbon (C)

Hardness: 10 (Mohs scale), Color: Colorless (D-grade), Luster: Adamantive, Crystal Structure: Isometric-Hexoctahedral, Cleavage: Perfect in four directions

Identified July 9, 2026More gemstone →

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Physical properties

Hardness: 10 (Mohs scale), Color: Colorless (D-grade), Luster: Adamantive, Crystal Structure: Isometric-Hexoctahedral, Cleavage: Perfect in four directions

Formation & geological history

Formed deep in the Earth's mantle under extreme pressure and temperature, typically billion of years old, transported to the surface via kimberlite volcanic eruptions.

Uses & applications

Primarily used in jewelry (engagement rings, necklaces), and industrially as an abrasive for cutting and drilling due to its supreme hardness.

Geological facts

Diamond is the hardest known natural substance. The specific cut shown appears to be a round brilliant cut, designed to maximize light return (brilliance and fire).

Field identification & locations

Identify by testing for thermal conductivity and hardness; synthetic moissanite or cubic zirconia are common look-alikes. Found globally in regions like Botswana, Russia, and Canada.