gemstone

Likely black cabochon gemstone pendant

Uncertain; possibly black star sapphire, black spinel, or obsidian

AI-generated identification · may be incorrect

A polished, opaque-to-translucent dark cabochon with a bright reflective highlight, set in metal. Exact hardness, crystal structure, cleavage, and specific gravity cannot be determined from the photograph; the surface may be glassy and the stone appears approximately 8–12 mm.

Identified August 21, 2026More gemstone →

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At a glance

Common name: Likely black cabochon gemstone pendant
Scientific name: Uncertain; possibly black star sapphire, black spinel, or obsidian
Category: gemstone
Identified: August 21, 2026
Method: Standard

AI Estimated Value

About $5–$30 if imitation glass or common stone in base metal; roughly $30–$150 if genuine black spinel or sapphire in silver, potentially more for verified high-quality material. A gemological test is needed for a reliable price.

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 geological origin is indeterminate visually. If sapphire or spinel, it formed in igneous or metamorphic environments; if obsidian, it is volcanic glass formed by rapid cooling, generally during geologically recent eruptions.

Uses & applications

Used as jewelry and decorative material. Common commercial value is mainly determined by the identity, treatment, size, and quality of the stone and the metal setting.

Geological facts

The radial metal design is a jewelry setting, not natural crystal structure. A single photograph cannot reliably distinguish black sapphire, spinel, obsidian, onyx, glass, or another dark cabochon.

Field identification & locations

Check with a loupe for asterism, inclusions, bubbles, and surface wear; test hardness and refractive index professionally, and inspect the setting for silver or gold hallmarks. The Spanish note “precio” means “price” but provides no specimen details.