gemstone

Turquoise cabochon jewelry

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

AI-generated identification · may be incorrect

The central blue-green oval appears to be a polished, opaque cabochon, likely turquoise or a turquoise imitation; metal settings and surrounding decorative stones obscure diagnostic features. Natural turquoise has Mohs hardness 5–6, waxy to subvitreous luster, cryptocrystalline structure, and no visible cleavage.

Identified August 10, 2026More gemstone →

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Physical properties

Formation & geological history

Turquoise forms as a secondary mineral in arid, oxidized copper deposits, commonly during the Cenozoic or younger weathering history of host rocks. The reported location near 51.5°N, 52.7°E is not a notable turquoise source, so a purchased imported or synthetic/treated stone is more likely than a locally formed specimen.

Uses & applications

Used in jewelry and ornament. Common-quality pieces typically sell for about $5–$30; better natural turquoise jewelry may range from $50–$500+, while imitation material can be under $10.

Geological facts

The image shows a jewelry-mounted stone rather than a naturally exposed specimen. Color may be enhanced by dyeing, waxing, stabilization, or imitation glass/plastic.

Field identification & locations

Turquoise is identified by its blue-to-green color, opaque appearance, low-to-moderate hardness, and often brown or black matrix veining. A magnifier, hardness test on an inconspicuous area, and professional gem testing are needed to distinguish natural turquoise from dyed howlite, glass, or plastic.