gemstone

Red glassy mineral specimen, likely synthetic ruby or red spinel

Most consistent with synthetic corundum (Al₂O₃, ruby) or synthetic spinel (MgAl₂O₄); exact identification requires testing

AI-generated identification · may be incorrect

Transparent vivid red, vitreous luster, irregular fracture, and no obvious natural crystal habit; apparent hardness is likely Mohs 8–9 if corundum/spinel. The roughly cubic shape may indicate cutting or laboratory growth rather than a natural crystal.

Identified September 20, 2026More gemstone →

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At a glance

Common name: Red glassy mineral specimen, likely synthetic ruby or red spinel
Scientific name: Most consistent with synthetic corundum (Al₂O₃, ruby) or synthetic spinel (MgAl₂O₄); exact identification requires testing
Category: gemstone
Identified: September 20, 2026
Method: Standard

AI Estimated Value

About $2–$25 if synthetic glass or common lab-grown material; $20–$200 if a confirmed attractive synthetic ruby/spinel specimen, while natural gem-quality material can range from hundreds to thousands of dollars.

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

Likely a laboratory-grown or cut gemstone; natural ruby and spinel form in metamorphic rocks over geological timescales, commonly during Precambrian to younger mountain-building events.

Uses & applications

Used as a jewelry simulant, display crystal, or collector specimen; synthetic corundum is also used abrasively and in watch bearings. Natural gem-quality examples may be valuable, while common synthetics are inexpensive.

Geological facts

Strong red color commonly comes from chromium impurities. A refractometer, polariscope, specific-gravity test, and hardness test are needed to distinguish ruby, spinel, garnet, and red glass.

Field identification & locations

Check for curved growth lines or gas bubbles (synthetic material/glass), inclusions, birefringence, and scratch resistance; a jeweler’s loupe and gemological testing are recommended. Natural sources include Myanmar, Mozambique, Sri Lanka, Tanzania, and Vietnam.