gemstone

Blue faceted gemstone, likely synthetic sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively magnesium aluminate spinel (MgAl₂O₄)

AI-generated identification · may be incorrect

Small round faceted, dark blue, transparent to translucent, vitreous luster. Sapphire hardness is Mohs 9; spinel is 7.5–8. Crystal structures are trigonal (corundum) or cubic (spinel); identification cannot be certain from the photograph alone.

Identified September 21, 2026More gemstone →

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At a glance

Common name: Blue faceted gemstone, likely synthetic sapphire or blue spinel
Scientific name: Corundum (Al₂O₃) if sapphire; alternatively magnesium aluminate spinel (MgAl₂O₄)
Category: gemstone
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 if synthetic or commercial quality; $50–$500+ for a natural small blue sapphire or spinel, with exceptional stones worth far more.

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 blue sapphire forms in metamorphic or igneous environments, commonly millions to billions of years old; blue color comes mainly from iron and titanium. Synthetic stones are laboratory-grown and may be chemically equivalent.

Uses & applications

Used primarily in jewelry; synthetic sapphire is also used for optical windows, watches, and electronics. Spinel is a jewelry gemstone and collector material.

Geological facts

The visible round shape and regular facets indicate a cut gemstone rather than a raw rock. A refractive-index test, microscope examination, and spectroscopy are needed for reliable identification and for separating natural from synthetic material.

Field identification & locations

Common sources of natural sapphire include Sri Lanka, Myanmar, Kashmir, Madagascar, Australia, and Montana; blue spinel occurs in Sri Lanka, Myanmar, and Vietnam. Check for inclusions, facet wear, and bubbles, but these are not definitive.