mineral

Diamond

Carbon (C)

Hardness: 10 (Mohs scale), Color: Clear/Colorless, Luster: Adamantine, Crystal Structure: Isometric-hexoctahedral, Cleavage: Perfect octahedral, Specific Gravity: 3.52

Identified June 28, 2026More mineral →

Explore Diamond in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 10 (Mohs scale), Color: Clear/Colorless, Luster: Adamantine, Crystal Structure: Isometric-hexoctahedral, Cleavage: Perfect octahedral, Specific Gravity: 3.52

Formation & geological history

Formed under extreme high pressure and temperature conditions in the Earth's mantle, approximately 150-250 kilometers deep, and brought to the surface by kimberlite pipe volcanic eruptions.

Uses & applications

Primary use in high-end jewelry (engagement rings) and industrial applications including cutting, grinding, and drilling due to extreme hardness.

Geological facts

Diamond is the hardest naturally occurring substance on Earth. Most natural diamonds are between 1 billion and 3.5 billion years old.

Field identification & locations

Identify by its ability to scratch any other material and its high refractive index (brilliance). It is commonly found in alluvial deposits or kimberlite pipes. Local coordinates in France (Angers region) are not typical for diamond mining, suggesting this is a commercial jewelry item.