gemstone

Round brilliant-cut diamond stud earrings

Diamond (crystalline carbon, C)

AI-generated identification · may be incorrect

Colorless, transparent, adamantine luster; cubic crystal structure; Mohs hardness 10. Faceted stones are held in metal settings; the image does not establish whether they are natural or lab-grown.

Identified October 15, 2026More gemstone →

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Physical properties

Colorless, transparent, adamantine luster; cubic crystal structure; Mohs hardness 10. Faceted stones are held in metal settings; the image does not establish whether they are natural or lab-grown.

Formation & geological history

Diamonds form under high pressure and temperature deep in Earth’s mantle and are brought near the surface by volcanic kimberlite or lamproite. Their ages commonly range from about 1–3 billion years.

Uses & applications

Used in jewelry and, because of their exceptional hardness, in cutting, grinding, and drilling tools.

Geological facts

A round brilliant cut is designed to maximize a diamond’s light return through precisely arranged facets.

Field identification & locations

Identify diamond by its extreme hardness, strong brilliance, and characteristic thermal conductivity; common sources include Botswana, Russia, Canada, Australia, and South Africa. Confirm identity and natural versus lab-grown origin with gemological testing.