gemstone

Faceted green gemstone, likely peridot

Olivine, gem-quality forsteritic olivine: (Mg,Fe)₂SiO₄

AI-generated identification · may be incorrect

Transparent yellowish-green oval cabochon or faceted stone with glassy luster; Mohs hardness 6.5–7, orthorhombic crystal structure, indistinct cleavage, and specific gravity about 3.2–4.3. The image is too small to confirm identity; tourmaline or another green gem is also possible.

Identified August 13, 2026More gemstone →

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Physical properties

Formation & geological history

Peridot forms in magnesium- and iron-rich igneous rocks and is commonly brought to the surface in basalt, mantle xenoliths, and rare pallasite meteorites. Gem deposits occur mainly in volcanic settings, generally from Phanerozoic geological environments.

Uses & applications

Used in jewelry and mineral collecting; quality depends on vivid color, transparency, clarity, cut, and size. Common commercial stones are relatively affordable, while fine large peridot or tourmaline can be substantially more valuable.

Geological facts

Peridot is one of the few gemstones occurring naturally in only one major color family, though shades range from yellow-green to olive. Its meteorite occurrence makes olivine an important clue to extraterrestrial and planetary geology.

Field identification & locations

Check for a warm yellow-green body color, glassy luster, moderate hardness, and possible “lily-pad” inclusions; gemological testing is needed for reliable identification. Major sources include Arizona, Pakistan, Myanmar, Egypt, and China.