gemstone

Diamond (Faceted)

Carbon (C)

Hardness: 10 (Mohs scale); Color: Colorless (in this specimen); Luster: Adamantine; Crystal Structure: Isometric (cubic); Cleavage: Perfect in four directions (octahedral); Specific Gravity: 3.52.

Hardness: 10 (Mohs scale)
Color: Colorless (in this specimen)
Luster: Adamantine

Identified July 10, 2026More gemstone →

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Physical properties

Hardness: 10 (Mohs scale); Color: Colorless (in this specimen); Luster: Adamantine; Crystal Structure: Isometric (cubic); Cleavage: Perfect in four directions (octahedral); Specific Gravity: 3.52.

Formation & geological history

Formed under extreme pressure and temperature conditions deep in the Earth's mantle, approximately 90 to 120 miles below the surface, and brought to the surface by kimberlite and lamproite volcanic eruptions.

Uses & applications

Predominantly used in jewelry (engagement rings, necklaces), and industrial applications such as cutting, drilling, and grinding tools due to its extreme hardness.

Geological facts

Diamonds are the hardest known natural substance. The word 'diamond' is derived from the Greek word 'adamas', meaning unbreakable.

Field identification & locations

Identify by its ability to scratch all other minerals, its high refractive index (fire/brilliance), and thermal conductivity. Often found in primary deposits (kimberlite pipes) or secondary alluvial deposits in riverbeds and coastal sands.