gemstone

Turquoise cabochon jewelry

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

AI-generated identification · may be incorrect

Opaque blue-green, typically waxy to subvitreous luster; Mohs hardness 5–6, cryptocrystalline structure, no visible cleavage, and specific gravity about 2.6–2.9. The surrounding metal appears to be silver-colored, possibly sterling silver; treatments or stabilization cannot be confirmed visually.

Identified August 16, 2026More gemstone →

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At a glance

Common name: Turquoise cabochon jewelry
Scientific name: Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
Category: gemstone
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Approximately $20–$100 for a small commercial silver-mounted piece; $100–$500+ for authenticated natural, vivid, untreated turquoise with desirable provenance.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Turquoise forms as a secondary mineral in arid, copper-rich, aluminum- and phosphate-bearing zones, commonly by groundwater alteration. Deposits are generally associated with relatively young weathering environments rather than a single geological age.

Uses & applications

Used extensively in cabochon jewelry, carvings, and collectibles; historically important in Southwestern Native American jewelry. Value depends strongly on color, matrix, provenance, treatment, and metal workmanship.

Geological facts

The vivid “robin’s-egg” blue color reflects copper, while green shades commonly indicate iron substitution or weathering. Famous sources include Iran, Arizona and Nevada, China, Mexico, and Chile.

Field identification & locations

Identify by its opaque blue-green color, relatively low hardness, and often brown or black host-rock matrix; glass or dyed composites can imitate it. A gemological test and metal hallmark are needed for confirmation.