gemstone

Blue cabochon ring stone, likely lapis lazuli or blue chalcedony

Uncertain from image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or cryptocrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Opaque to translucent deep blue, polished cabochon with vitreous-to-waxy luster; likely hardness Mohs 5–7 depending on material. The surrounding setting appears metal, possibly antique or gold-colored alloy.

Identified August 27, 2026More gemstone →

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At a glance

Common name: Blue cabochon ring stone, likely lapis lazuli or blue chalcedony
Scientific name: Uncertain from image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or cryptocrystalline quartz (SiO₂)
Category: gemstone
Identified: August 27, 2026
Method: Standard

AI Estimated Value

Approximately $10–$150 for a common mounted stone and costume/sterling setting; potentially $200+ if the stone and antique metalwork are verified high quality.

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

Lapis lazuli forms in metamorphosed limestone, especially in the Badakhshan region of Afghanistan; blue chalcedony forms in silica-rich volcanic cavities. Geological ages vary widely by deposit and cannot be determined from the photograph.

Uses & applications

Used in jewelry and ornamental objects; lapis lazuli is also valued as a historic pigment, while chalcedony is commonly used for cabochons and carvings.

Geological facts

Lapis lazuli commonly shows white calcite and metallic pyrite flecks, whereas blue chalcedony is usually more uniformly translucent and lacks pyrite. The image alone cannot distinguish them reliably.

Field identification & locations

Check for pyrite/calcite inclusions, translucency at the edges, streak, and hardness; avoid scratching the mounted stone. Common sources include Afghanistan, Chile, Russia, Turkey, and various chalcedony localities.