gemstone

Cut gemstone, likely diamond

Diamond (crystalline carbon, C)

AI-generated identification · may be incorrect

Appears to be a small faceted, colorless-to-pale gemstone with strong white brilliance; diamond has Mohs hardness 10, adamantine luster, cubic crystal structure, and no cleavage visible here. Identification cannot be certain from the photograph alone because glass, cubic zirconia, or moissanite can look similar.

Identified August 30, 2026More gemstone →

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Physical properties

Formation & geological history

Natural diamonds crystallize deep in Earth’s mantle under extreme pressure and temperature, commonly over 1 billion years ago, and reach the surface in kimberlite or lamproite eruptions; this appears cut and polished.

Uses & applications

Used primarily in jewelry and, industrially, for cutting, drilling, grinding, and polishing. Value depends strongly on carat weight, cut, color, clarity, and certification.

Geological facts

A diamond’s extreme hardness does not mean it is unbreakable: it has four cleavage directions and can chip under impact. Thermal-conductivity and refractive-index testing distinguish it from common simulants.

Field identification & locations

Check for crisp facet junctions, exceptional brilliance, and lack of bubbles or mold marks; definitive identification requires a gem tester or laboratory report. Major sources include Botswana, Russia, Canada, Australia, and southern Africa.