gemstone

Rough emerald specimens

Beryl, Be₃Al₂Si₆O₁₈, colored green by chromium and/or vanadium

AI-generated identification · may be incorrect

Typically Mohs hardness 7.5–8, vitreous luster, hexagonal crystal structure, poor cleavage, and green to blue-green color; these pieces appear heavily included and partly matrix-bearing. The rounded edges and surface texture suggest rough or broken natural material, though exact identification requires testing.

Identified September 14, 2026More gemstone →

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Physical properties

Formation & geological history

Emerald forms in hydrothermal or pegmatitic environments where beryllium-rich fluids interact with chromium/vanadium-bearing rocks, commonly in metamorphic zones. Major deposits occur in Colombia, Zambia, Brazil, Afghanistan, and Ethiopia; individual crystals may range from millions to hundreds of millions of years old.

Uses & applications

Transparent material is cut for jewelry; included or opaque pieces are sold as mineral specimens, cabochons, or carvings. Emerald has little construction or industrial use compared with ordinary beryl.

Geological facts

Natural emerald commonly contains fractures and inclusions, traditionally called jardin (“garden”). Similar green rough material may instead be green fluorite, glass, or dyed beryl, so visual identification alone is uncertain.

Field identification & locations

Check for hexagonal crystal form, glassy luster, inclusions, and hardness; a gemological refractive-index, specific-gravity, and spectroscopy test is needed for confirmation. Avoid scratching valuable pieces; provenance strongly affects identification and value.