gemstone

Blue glass-like cabochon, likely dyed or synthetic material

Uncertain; possibly dyed chalcedony, synthetic spinel, or blue glass

AI-generated identification · may be incorrect

Smooth oval cabochon with deep cobalt-blue color, vitreous luster, and no visible crystal faces or cleavage. Hardness cannot be determined visually; genuine chalcedony is about 6.5–7 Mohs, while glass is about 5–6.

Identified September 15, 2026More gemstone →

Explore Blue glass-like cabochon, likely dyed or synthetic material 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 glass-like cabochon, likely dyed or synthetic material
Scientific name: Uncertain; possibly dyed chalcedony, synthetic spinel, or blue glass
Category: gemstone
Identified: September 15, 2026
Method: Standard

AI Estimated Value

About $1–$15 if glass, dyed stone, or synthetic; approximately $10–$75 if confirmed natural blue chalcedony, depending on quality and provenance.

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

The image is insufficient for reliable identification; the perfectly smooth, uniform appearance suggests a polished or manufactured specimen rather than a natural crystal. If chalcedony, it formed from silica-rich groundwater filling cavities, commonly during volcanic activity.

Uses & applications

Used as costume jewelry, decorative cabochons, or craft material; natural blue chalcedony can have modest jewelry value, whereas dyed or glass examples are inexpensive.

Geological facts

Strongly uniform cobalt-blue color is uncommon in untreated natural chalcedony and commonly indicates dyeing, synthesis, or glass. The surrounding colored pieces also appear like decorative craft stones or glass.

Field identification & locations

Check with a loupe for bubbles, dye concentration in cracks, or a molded seam; test hardness only on an inconspicuous area, and use refractive index or specific-gravity testing for confirmation. Similar materials occur in jewelry markets worldwide.