Rock Identifier
Emerald (green beryl) (Beryl, Be₃Al₂Si₆O₁₈; green color typically from chromium and/or vanadium) — gemstone
gemstone

Emerald (green beryl)

Beryl, Be₃Al₂Si₆O₁₈; green color typically from chromium and/or vanadium

AI-generated identification · may be incorrect

Vivid green, translucent to opaque, vitreous luster; hexagonal crystal structure, Mohs hardness 7.5–8, specific gravity about 2.7. The pictured piece appears to be a small cut or polished emerald, though image alone cannot confirm its identity or treatment.

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Physical properties

Vivid green, translucent to opaque, vitreous luster; hexagonal crystal structure, Mohs hardness 7.5–8, specific gravity about 2.7. The pictured piece appears to be a small cut or polished emerald, though image alone cannot confirm its identity or treatment.

Formation & geological history

Forms in hydrothermal veins and pegmatites, commonly where beryllium-bearing fluids interact with chromium- or vanadium-rich rocks. Emerald deposits occur in rocks of varied ages, from Precambrian to much younger.

Uses & applications

Used in jewelry and as a collector gemstone; lower-grade material may be fashioned into beads or carvings.

Geological facts

Not all green beryl is emerald: gemological standards require a sufficiently strong green hue, commonly linked to chromium or vanadium.

Field identification & locations

Look for characteristic inclusions (“jardin”), strong green color, and hardness, but laboratory testing is needed to distinguish natural emerald from imitations or treated stones. Major sources include Colombia, Zambia, Brazil, and Afghanistan.