gemstone

Faceted red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium; identification from the image is uncertain

AI-generated identification · may be incorrect

Transparent, vivid red, vitreous luster, faceted rectangular cut; corundum has Mohs hardness 9 and a trigonal crystal structure with no true cleavage. A photograph cannot confirm whether this is ruby or another red gem or synthetic material.

Identified October 11, 2026More gemstone →

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At a glance

Common name: Faceted red gemstone, likely ruby
Scientific name: Corundum (Al₂O₃), colored red by chromium; identification from the image is uncertain
Category: gemstone
Identified: October 11, 2026
Method: Standard

AI Estimated Value

Approximately $5–$100 if synthetic or imitation; natural stones can range from tens of dollars to thousands or more, depending on verified quality and size.

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 ruby forms in metamorphic rocks or certain igneous deposits; ruby-bearing deposits range from ancient to geologically recent. Synthetic rubies are also commonly produced for jewelry and industry.

Uses & applications

Used in jewelry and, owing to its hardness, in specialty optical and industrial applications.

Geological facts

Ruby and sapphire are both gem-quality corundum; the red color distinguishes ruby. Color, clarity, treatment, origin, and whether it is natural or synthetic strongly affect value.

Field identification & locations

Look for corundum’s exceptional hardness and glassy luster, but reliable identification requires gemological testing. Natural rubies occur in Myanmar, Mozambique, Sri Lanka, and other regions.