gemstone

Small faceted gemstone, likely diamond

Diamond (crystalline carbon, C)

AI-generated identification · may be incorrect

Colorless, transparent, adamantine luster, cubic crystal structure, Mohs hardness 10, and no visible cleavage at this scale. The image appears to show a tiny cut stone or stone in a metal setting, but identification cannot be confirmed visually.

Identified August 23, 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, then reach the surface in kimberlite or lamproite volcanic pipes; synthetic diamonds are lab-grown.

Uses & applications

Used primarily in jewelry and as an industrial abrasive or cutting material. Value depends strongly on carat weight, cut, color, clarity, certification, and whether it is natural or laboratory-grown.

Geological facts

Diamond is the hardest naturally occurring mineral, though hardness varies by crystal direction. A loupe, refractive-property testing, thermal/electrical testing, and gem-laboratory certification are needed for reliable identification.

Field identification & locations

Look for strong fire, sharp facet reflections, exceptional scratch resistance, and high density, but these traits are not conclusive; cubic zirconia, moissanite, and glass can resemble it. Common natural sources include southern Africa, Russia, Canada, and Australia.