gemstone

Diamond (or Diamond Simulant)

Carbon (C)

Hardness: 10 (Mohs scale), Color: Colorless (in this specimen), Luster: Adamantine, Crystal structure: Isometric-hexoctahedral, 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: Isometric-hexoctahedral, Cleavage: Octahedral, Specific Gravity: 3.52

Formation & geological history

Formed under high temperature and pressure conditions deep within the Earth's mantle, brought to the surface through volcanic pipes (kimberlites and lamproites) typically dating back billions of years.

Uses & applications

Primary use in high-end jewelry (engagement rings, necklaces), and industrial applications for cutting, grinding, and drilling due to its extreme hardness.

Geological facts

Diamonds are the hardest known natural substance. The Hope Diamond and the Cullinan are among the most famous specimens in history. Many small loose stones like this are often synthetic or simulants like Cubic Zirconia.

Field identification & locations

Identification in the field is rare; they are found in alluvial deposits or within kimberlite pipes. Collectors look for clarity, cut, color, and carat weight. Professional testing (refractive index and thermal conductivity) is required for small faceted stones.