gemstone

Diamond (Heart Cut)

Carbon (C)

Hardness: 10 (Mohs scale), Color: Colorless to faint pink/lavender (as shown), Luster: Adamantine, Crystal Structure: Cubic, Cleavage: Perfect octohedral, Specific Gravity: 3.51

Identified July 6, 2026More gemstone →

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Physical properties

Hardness: 10 (Mohs scale), Color: Colorless to faint pink/lavender (as shown), Luster: Adamantine, Crystal Structure: Cubic, Cleavage: Perfect octohedral, Specific Gravity: 3.51

Formation & geological history

Formed under high-pressure, high-temperature conditions in the Earth's mantle, approximately 100 miles underground, and brought to the surface by volcanic eruptions (kimberlite pipes). Geological age ranges from 1 to 3.5 billion years.

Uses & applications

Primarily used in jewelry (as a faceted gemstone) due to its brilliance and durability. Industrial-grade diamonds are used for cutting, grinding, and drilling tools.

Geological facts

Diamond is the hardest natural substance on Earth. Rose-tinted or pink diamonds are among the rarest and most valuable colored diamonds in the world, often gaining color from plastic deformation of the crystal lattice.

Field identification & locations

Identify by its extreme hardness, high refractive index (brilliance), and thermal conductivity. While this specimen is faceted, in the field diamonds are often found in kimberlite rock or alluvial deposits.