mineral

Diamond (in a gold setting)

Carbon (C)

Hardness: 10 (Mohs scale), Color: Colorless (in this specimen), Luster: Adamantine, Crystal Structure: Isometric-hexoctahedral, Cleavage: Octahedral, Specific Gravity: 3.52

Identified May 23, 2026More mineral →

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: Colorless (in this specimen), Luster: Adamantine, Crystal Structure: Isometric-hexoctahedral, Cleavage: Octahedral, Specific Gravity: 3.52

Formation & geological history

Formed under high-pressure, high-temperature conditions in Earth's mantle, typically at depths of 140 to 190 kilometers. They are brought to the surface through volcanic eruptions known as kimberlites.

Uses & applications

Used primarily in fine jewelry (engagement rings, necklaces) and extensively in industry for cutting, drilling, and grinding due to its extreme hardness.

Geological facts

Diamonds are the hardest known natural material on Earth. Most natural diamonds have ages between 1 billion and 3.5 billion years.

Field identification & locations

Identified by its high refractive index, extreme hardness, and specific thermal conductivity. Look for a 'hallmark' on the inside of the ring band to identify metal purity (e.g., 14k, 18k).