gemstone

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

AI-generated identification · may be incorrect

Oval, domed, highly polished blue cabochon with strong reflective sheen, set in a metal ring. Hardness, crystal structure, and specific gravity cannot be determined from the photograph; its uniform color and appearance are not enough to confirm a natural stone.

Identified September 23, 2026More gemstone →

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At a glance

Common name: Blue cabochon gemstone, likely synthetic spinel or glass
Scientific name: Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass
Category: gemstone
Identified: September 23, 2026
Method: Standard

AI Estimated Value

About $1–$30 for common glass or synthetic-stone jewelry; substantially more is possible if testing confirms a valuable natural gem.

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 does not establish the material or whether it is natural or synthetic. If synthetic spinel, it was lab-grown; natural spinel forms in metamorphic rocks and some igneous deposits.

Uses & applications

Used as a decorative ring stone; blue synthetic spinel and glass are common, affordable jewelry materials.

Geological facts

A photo cannot reliably distinguish blue spinel, sapphire, glass, or other blue stones. Gemological testing—such as refractive index, magnification, or spectroscopy—is needed for identification.

Field identification & locations

No geological locality can be inferred from the image, and the reported Jakarta-area location does not identify a mounted stone’s source. Check for bubbles or mold marks (glass clues) and have a jeweler test it; visual inspection alone is inconclusive.