gemstone

Diamond (mounted in an ornate ring)

Diamond, crystalline carbon (C)

AI-generated identification · may be incorrect

The central transparent, faceted stone may be diamond, but the photograph cannot confirm its identity or distinguish it from another gem or imitation. Diamond has Mohs hardness 10, cubic crystal structure, adamantine luster, and no cleavage visible in a mounted stone; the ring appears to be gold-colored metal.

Identified October 13, 2026More gemstone →

Explore Diamond (mounted in an ornate ring) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Natural diamonds crystallize deep in Earth’s mantle under extreme pressure and temperature, commonly billions of years ago, and reach the surface in kimberlite or lamproite eruptions. The stone’s natural or synthetic origin is not determinable from the image.

Uses & applications

Diamonds are used in jewelry and industrial cutting and abrasives; the ring’s decorative setting is likely precious-metal jewelry.

Geological facts

A faceted appearance alone does not establish that a stone is diamond; gemological testing is needed, and the setting can obscure diagnostic features.

Field identification & locations

Have a jeweler or gemologist test the loose stone or assess it with appropriate instruments; do not rely on scratch tests. Diamonds occur worldwide, with major deposits in southern Africa, Russia, Canada, and Australia.