gemstone

Diamond (set in an ornate ring)

Diamond, crystalline carbon (C)

AI-generated identification · may be incorrect

The image shows a faceted, colorless-to-gray gemstone, likely a diamond, in a gold-colored metal setting; identification is uncertain from the photo alone. Diamond has Mohs hardness 10, adamantine luster, and a cubic crystal structure; the setting obscures diagnostic features.

Identified October 12, 2026More gemstone →

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Physical properties

Formation & geological history

Natural diamonds crystallize deep in Earth’s mantle under high pressure and temperature, commonly billions of years ago, then reach the surface in kimberlite or lamproite pipes. The pictured stone is cut and mounted, so its origin and treatment cannot be determined visually.

Uses & applications

Diamonds are used in jewelry and, due to their hardness, in industrial cutting and drilling tools. The ring’s metal setting appears gold-colored, but its metal content is not identifiable from the image.

Geological facts

A faceted appearance alone cannot distinguish diamond from moissanite, white sapphire, or glass; gemological testing is needed.

Field identification & locations

The stone’s brilliance and cutting are visible, but confirm identity with a jeweler’s thermal/electrical conductivity test and verify metal stamps separately. Diamonds occur in deposits including South Africa, Botswana, Canada, Russia, and Australia.