gemstone

Turquoise cabochon ring

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

AI-generated identification · may be incorrect

Blue-green, opaque, waxy to subvitreous luster; Mohs hardness 5–6, typically cryptocrystalline and without visible cleavage. The surrounding metal appears to be a silver-colored setting, possibly sterling silver.

Identified August 16, 2026More gemstone →

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Physical properties

Formation & geological history

Turquoise forms as a secondary mineral in arid, copper-rich weathering zones, commonly replacing rock in veins and nodules. Deposits are geologically young relative to their host rocks and occur in regions such as Iran, the American Southwest, Mexico, China, and Egypt.

Uses & applications

Used extensively in jewelry, ornamental carvings, and collectible inlay; quality depends on color, matrix, hardness, and whether it is natural or treated. It is not primarily a construction material.

Geological facts

The strongest blue-green color and minimal matrix generally command the highest prices. Many commercial pieces are stabilized with resin, reconstituted, dyed, or made from turquoise-bearing composite material.

Field identification & locations

Identify genuine turquoise by its opaque blue-green color, relatively soft surface, and often irregular brown or black matrix; glassy transparency or extreme hardness suggests an imitation. Exact origin and treatment require testing or gemological analysis.