gemstone

Clear rough diamond (possible)

Diamond, crystalline carbon (C)

AI-generated identification · may be incorrect

Small, colorless-to-translucent rough crystal with a roughly octahedral shape; diamond has Mohs hardness 10, adamantine luster, and cubic crystal structure. The photo alone cannot confirm that it is diamond; quartz or another clear mineral could look similar.

Identified October 16, 2026More gemstone →

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Physical properties

Formation & geological history

Natural diamonds crystallize deep in the mantle under high pressure and temperature, commonly billions of years ago, and reach the surface in kimberlite or lamproite eruptions.

Uses & applications

Gemstones and industrial abrasives or cutting tools; only gem-quality stones are typically used in jewelry.

Geological facts

Diamond is the hardest naturally occurring mineral, but hardness alone does not establish identity; refractive and thermal-conductivity tests are used for verification.

Field identification & locations

The apparent angular shape is suggestive but not diagnostic. Have it examined by a gemologist; common sources include southern Africa, Russia, Canada, and Australia.