gemstone

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

AI-generated identification · may be incorrect

Highly polished oval cabochon with blue-green body color and vitreous luster; no visible crystal faces or cleavage. If chalcedony, hardness is about 6.5–7 Mohs and specific gravity about 2.6; the metal ring and reflections obscure internal features.

Identified August 14, 2026More gemstone →

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At a glance

Common name: Blue-green cabochon, likely chalcedony or treated glass imitation
Scientific name: Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image
Category: gemstone
Identified: August 14, 2026
Method: Standard

AI Estimated Value

Approximately $10–$100 for a common mounted imitation or chalcedony ring; $100–$500+ if confirmed as fine natural chrysoprase or another quality gemstone.

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

Natural chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; its age varies widely. The photographed material is mounted in jewelry and could also be dyed chalcedony, turquoise-like material, or man-made glass.

Uses & applications

Used for rings, cabochons, carvings, and ornaments. Common-quality pieces generally have modest value, while attractive natural chrysoprase or fine chalcedony can be more valuable.

Geological facts

The smooth dome and uniform color are typical of a cabochon, not a raw specimen. Strong reflected highlights and the opaque setting prevent reliable separation of chalcedony from glass or other green gemstones.

Field identification & locations

Common regional possibilities near 6.6°S, 106.8°E (West Java) include chalcedony and other silica-rich volcanic-hosted materials. Check with a loupe for bubbles (glass), dye concentrations or fissures, and use hardness, refractive index, and specific-gravity testing; avoid scratching the mounted stone.