gemstone

Small faceted dark gemstone, possibly spinel or sapphire

Uncertain; candidates include MgAl₂O₄ spinel or corundum (Al₂O₃) sapphire

AI-generated identification · may be incorrect

A tiny, polished/faceted, steel-blue to gray stone with bright vitreous reflections and a reddish-brown facet or mounting edge. Spinel hardness is ~7.5–8 Mohs; sapphire is 9; crystal structure cannot be confirmed from the image.

Identified September 11, 2026More gemstone →

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At a glance

Common name: Small faceted dark gemstone, possibly spinel or sapphire
Scientific name: Uncertain; candidates include MgAl₂O₄ spinel or corundum (Al₂O₃) sapphire
Category: gemstone
Identified: September 11, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 as an unidentified small specimen; potentially $25–$300+ if verified as a clean, natural sapphire or spinel, depending on color and treatment.

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

These gemstones crystallize in igneous or metamorphic environments, commonly in marble, basalt-related deposits, or alluvial gravels. Geological ages vary widely by locality, from ancient Precambrian rocks to younger volcanic systems.

Uses & applications

Used primarily in jewelry and collecting; sapphire is also used for durable watch crystals and optical components. The apparent small size and heavy inclusions limit likely gem value.

Geological facts

The image may show a cut stone rather than a natural crystal, and the red-brown perimeter could be a metal setting or coating rather than part of the mineral. Identification requires refractive index, specific gravity, and hardness or spectroscopy testing.

Field identification & locations

Check for uniform faceting, strong dispersion, and absence of bubbles; glass commonly shows rounded bubbles and lower hardness. A jeweler’s loupe, refractometer, and professional gem test are needed for reliable identification.