gemstone

Diamond (Baguette cut)

Carbon (C)

Hardness: 10 (Mohs scale); Color: Colorless (D-F); Luster: Adamantine; Crystal structure: Isometric (Cubic); Cleavage: Perfect octahedral; Specific gravity: 3.51

Hardness: 10 (Mohs scale)
Color: Colorless (D-F)
Luster: Adamantine

Identified July 5, 2026More gemstone →

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Physical properties

Hardness: 10 (Mohs scale); Color: Colorless (D-F); Luster: Adamantine; Crystal structure: Isometric (Cubic); Cleavage: Perfect octahedral; Specific gravity: 3.51

Formation & geological history

Formed under high heat and extreme pressure within the Earth's mantle, approximately 100 miles below the surface, usually over 1 billion years ago. Transported to the surface by deep-source volcanic eruptions (kimberlite pipes).

Uses & applications

Primary use in jewelry settings, industrial drill bits, cutting tools, and high-end abrasives due to extreme hardness.

Geological facts

Diamonds are the hardest known natural substance. The stones in this pendant are 'Baguette cut,' a rectangular step-cut style popular in Art Deco jewelry.

Field identification & locations

Identify via high refractive index, heat conductivity testing, and inspection of sharp facet edges. Commonly sourced from South Africa, Russia, Canada, and Australia.