mineral

Rough Diamond

Diamond (pure Carbon, C)

Hardness: 10 (Mohs scale), Color: Dirty green/gray/yellowish, Luster: Adamantine to greasy (in rough state), Crystal structure: Isometric-hexoctahedral, Cleavage: Perfect octahedral, Specific gravity: 3.52

Identified April 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed under high-pressure and high-temperature conditions deep within the Earth's mantle (150-250 km deep). They are brought to the surface through deep-origin volcanic eruptions known as kimberlites or lamproites.

Uses & applications

Industrial abrasives, cutting tools, and if gem-quality, used in jewelry and high-end investment collecting.

Geological facts

Rough diamonds often look like ordinary pebbles or pieces of glass to the untrained eye. This specimen appears to be 'bort' or industrial grade based on its color and irregular shape.

Field identification & locations

Identify in the field by its extreme hardness (cannot be scratched by anything else) and high luster when cleaned. Commonly found in alluvial deposits (river beds) or kimberlite pipes in regions like Africa, Russia, and Canada.