gemstone

Blue turquoise cabochon

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely dyed or stabilized, flower-shaped polished piece

AI-generated identification · may be incorrect

Hardness 5–6 Mohs; vivid blue, opaque, waxy to vitreous luster, cryptocrystalline structure, poor cleavage, specific gravity about 2.6–2.8. The unusually uniform color and smooth shaped cut suggest treatment or a turquoise composite, though blue-dyed howlite cannot be excluded from the image alone.

Identified August 31, 2026More gemstone →

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Physical properties

Formation & geological history

Turquoise forms as a secondary phosphate mineral in arid, copper-rich zones through groundwater alteration, commonly in Cenozoic weathering environments. Major sources include Iran, the southwestern United States, China, Chile, and Egypt.

Uses & applications

Used for cabochon jewelry, beads, inlay, carvings, and ornamental objects; genuine high-grade untreated turquoise is collectible. Lower-grade material is commonly stabilized with resin or dyed to improve durability and color.

Geological facts

Natural turquoise often shows matrix veining and variable blue-green color; flawless saturated blue is comparatively rare. It is porous and may discolor or absorb oils, cosmetics, and chemicals.

Field identification & locations

Identify by opaque blue-green color, low-to-moderate hardness, waxy luster, and a streak that is pale blue to white; avoid acid, heat, and prolonged soaking. Confirm identity with gemological testing because dyed howlite, resin composites, and glass can look similar.