gemstone

Turquoise and coral bead necklace

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; coral: chiefly CaCO₃ (aragonite or calcite)

AI-generated identification · may be incorrect

The blue beads resemble turquoise, a hydrated copper-aluminum phosphate (Mohs 5–6); orange-red beads resemble coral, calcium carbonate (Mohs 3–4). Both are opaque with a waxy to dull luster; the metallic-looking round beads may be silver or another material and cannot be identified from the image.

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Turquoise forms through near-surface alteration of copper-bearing rocks in arid environments; coral forms biologically in marine reefs. Their ages and geographic sources cannot be determined from appearance alone.

Uses & applications

Used in jewelry and ornamental objects; turquoise is also a collectible gemstone, while coral is used decoratively and is subject to conservation and trade restrictions.

Geological facts

The necklace combines materials with very different origins and hardnesses; turquoise may be stabilized or dyed, and coral may be natural or imitation.

Field identification & locations

Visible blue and orange-red beads suggest turquoise and coral, but visual inspection cannot confirm either; check for natural texture, wear, and gemological testing. Turquoise is found in arid regions including the southwestern United States and Iran; coral occurs in reefs worldwide.