gemstone

Cut red gemstone, likely ruby

Ruby, gem-quality corundum (Al₂O₃) colored by chromium

AI-generated identification · may be incorrect

A transparent, step-cut red stone with vitreous luster; corundum has trigonal crystal structure, Mohs hardness 9, and no true cleavage. The photo alone cannot confirm that it is ruby or distinguish natural from synthetic material or imitation.

Identified September 29, 2026More gemstone →

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At a glance

Common name: Cut red gemstone, likely ruby
Scientific name: Ruby, gem-quality corundum (Al₂O₃) colored by chromium
Category: gemstone
Identified: September 29, 2026
Method: Standard

AI Estimated Value

Value ranges widely: roughly $20–$500 for many small synthetic or commercial stones, while fine natural rubies can cost thousands to millions of dollars per carat; origin, treatment, and certification matter.

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 aluminum-rich, silica-poor metamorphic rocks and some igneous-related deposits; deposits range from ancient to geologically recent. Synthetic ruby is also commonly manufactured for jewelry and industrial use.

Uses & applications

Used in jewelry and, because of its hardness, in some precision and industrial applications.

Geological facts

Ruby and sapphire are varieties of the same mineral, corundum; chromium produces ruby’s red color.

Field identification & locations

The vivid red color and faceted cut are consistent with ruby, but identification requires gemological tests such as refractive-index and inclusion examination. Natural rubies occur notably in Myanmar, Mozambique, Thailand, and Sri Lanka.