gemstone

Diamond engagement ring

Diamond, crystalline carbon (C)

AI-generated identification · may be incorrect

The center stone appears to be a faceted, near-colorless diamond in a rectangular radiant or cushion-style cut, with very high luster and strong brilliance; Mohs hardness 10, cubic crystal structure, and no visible cleavage in the finished setting. Metal and accent stones are not reliably identifiable from the image.

Identified September 19, 2026More gemstone →

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Physical properties

Formation & geological history

Natural diamonds formed deep in Earth’s mantle under extreme pressure and temperature, mostly 1–3.5 billion years ago, then reached the surface in kimberlite or lamproite. Laboratory-grown diamond has the same composition and properties but a recent manufacturing origin; origin cannot be determined visually.

Uses & applications

Used primarily in jewelry for its durability and optical dispersion; industrial diamond is used for cutting, drilling, grinding, and polishing. Value depends on the 4Cs—carat, color, clarity, and cut—plus certification and mounting.

Geological facts

Diamond is the hardest natural mineral but can chip along cleavage directions. Faceting produces fire (dispersion) and scintillation; visual inspection alone cannot distinguish natural, laboratory-grown, or simulant stones.

Field identification & locations

Identify by exceptional brilliance, resistance to scratching, and a certified gemological report; definitive testing requires professional equipment. Common mining regions include Botswana, Canada, Russia, Australia, and southern Africa.