gemstone

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

AI-generated identification · may be incorrect

Polished oval cabochon with deep blue color, vitreous luster, and apparent translucency; quartz hardness is about 7 Mohs, while glass is about 5–6. No crystal structure or cleavage is visible in the cut form.

Identified September 18, 2026More gemstone →

Explore Blue glassy cabochon, likely blue quartz or synthetic glass in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Blue glassy cabochon, likely blue quartz or synthetic glass
Scientific name: Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive
Category: gemstone
Identified: September 18, 2026
Method: Standard

AI Estimated Value

About $2–$20 if common dyed quartz, chalcedony, or glass; $20–$100+ if verified natural blue quartz of attractive 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

If quartz, it formed through silica-rich hydrothermal or sedimentary processes; blue color may result from inclusions or dyeing. If glass, it is human-made and not geological; age cannot be determined from the image.

Uses & applications

Used as a cabochon in jewelry or as a lapidary collectible; value depends strongly on confirmed material, color, clarity, and workmanship.

Geological facts

The rounded shape and internal blue-purple swirls are typical of a polished cabochon, but they can also occur in manufactured glass or resin.

Field identification & locations

Check with a loupe for bubbles (glass), dye concentration in cracks (dyed stone), and hardness using professional testing; refractive index and specific gravity provide reliable identification. Similar blue quartz and chalcedony occur in Brazil, Madagascar, and the United States.