gemstone
Diamond
Carbon (C)
AI-generated identification · may be incorrectMohs hardness of 10, colorless or tinted, adamantine luster, isometric crystal system, perfect octahedral cleavage, specific gravity of 3.51-3.52.
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Physical properties
Mohs hardness of 10, colorless or tinted, adamantine luster, isometric crystal system, perfect octahedral cleavage, specific gravity of 3.51-3.52.
Formation & geological history
Formed under extreme heat and pressure in Earth's mantle, approximately 150 to 200 kilometers deep, and brought to the surface by deep-source volcanic eruptions.
Uses & applications
Extremely valuable for fine jewelry and engagement rings, as well as industrial cutting, grinding, and drilling tools due to its unmatched hardness.
Geological facts
Diamond is the hardest known natural substance on Earth. Famous large specimens include the Cullinan diamond, the largest gem-quality diamond ever found.
Field identification & locations
Identified by its supreme hardness, high refractive index, and adamantine luster. Found globally in kimberlite pipes, alluvial deposits, and river beds.
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Silicon Dioxide (SiO2) with Hematite inclusions
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