gemstone

Blue gemstone in a decorative setting (possibly blue spinel or sapphire)

Unidentified blue faceted gemstone; sapphire is corundum (Al₂O₃), while spinel is MgAl₂O₄

AI-generated identification · may be incorrect

Small, faceted blue stone with vitreous luster in a metal setting. Hardness and crystal structure cannot be determined from the photograph; sapphire is Mohs 9 and spinel 7.5–8.

Identified October 2, 2026More gemstone →

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At a glance

Common name: Blue gemstone in a decorative setting (possibly blue spinel or sapphire)
Scientific name: Unidentified blue faceted gemstone; sapphire is corundum (Al₂O₃), while spinel is MgAl₂O₄
Category: gemstone
Identified: October 2, 2026
Method: Standard

AI Estimated Value

Approximately $5–$100 for a small costume or common-stone piece; potentially more if confirmed as quality natural sapphire.

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

Small, faceted blue stone with vitreous luster in a metal setting. Hardness and crystal structure cannot be determined from the photograph; sapphire is Mohs 9 and spinel 7.5–8.

Formation & geological history

The stone’s identity and geological origin cannot be established visually. Sapphire forms in igneous or metamorphic rocks; spinel occurs in metamorphic rocks and some igneous deposits.

Uses & applications

Jewelry ornament; exact stone and setting materials are unknown.

Geological facts

Color and faceting alone cannot reliably distinguish sapphire, spinel, glass, or other blue gems.

Field identification & locations

A gemological test, such as refractive-index measurement, is needed for identification; inspect for a maker’s mark and metal stamp. Value depends on gem identity, quality, size, and setting.