gemstone

Green faceted gemstone, likely tsavorite garnet

Tsavorite: green grossular garnet, Ca₃Al₂(SiO₄)₃

AI-generated identification · may be incorrect

Vivid green, transparent, vitreous luster, and faceted; garnet has Mohs hardness 6.5–7.5, cubic crystal structure, no cleavage, and specific gravity about 3.6. The photograph cannot exclude green tourmaline, emerald, or synthetic glass.

Identified August 15, 2026More gemstone →

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Physical properties

Formation & geological history

Tsavorite forms in metamorphosed, calcium-rich rocks, commonly near hydrothermal systems, with formation generally associated with Precambrian East African geology. Important sources include Kenya and Tanzania.

Uses & applications

Used primarily as a jewelry gemstone; fine saturated stones can rival emeralds but are usually smaller because large clean crystals are uncommon.

Geological facts

Tsavorite is prized for strong color without requiring routine clarity treatment. Its green color is mainly produced by vanadium and sometimes chromium.

Field identification & locations

Field identification requires gemological testing: refractive index, specific gravity, and spectroscopy; garnet’s lack of cleavage and single refractive index are useful clues. Common rough material occurs in Kenya and Tanzania.