gemstone

Diamond ring

Diamond, crystalline carbon (C), likely a faceted mounted stone

AI-generated identification · may be incorrect

Mohs hardness 10; typically colorless, adamantine luster, cubic crystal structure, perfect octahedral cleavage, and specific gravity about 3.52. The image shows a bright, faceted transparent gemstone in a metal setting, though exact identity cannot be confirmed from appearance alone.

Identified September 15, 2026More gemstone →

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Physical properties

Formation & geological history

Natural diamonds formed deep in Earth’s mantle under extreme pressure and temperature, commonly 1–3.5 billion years ago, and reached the surface in kimberlite or lamproite pipes. Laboratory-grown diamonds have the same composition and crystal structure but a modern synthetic origin.

Uses & applications

Used primarily in jewelry and as an industrial abrasive or cutting material. Value depends strongly on carat weight, cut, color, clarity, certification, and whether it is natural or laboratory-grown.

Geological facts

Diamond is the hardest naturally occurring mineral, although it can be chipped along cleavage planes. A gemological certificate and testing are required to distinguish diamond from cubic zirconia, moissanite, or other simulants.

Field identification & locations

Field clues include exceptional hardness, strong brilliance, and high thermal conductivity, but visual inspection is unreliable; use a qualified jeweler or gem laboratory. Major natural sources include Botswana, Russia, Canada, Australia, and southern Africa.