gemstone

Faceted red gemstone, likely ruby

Corundum (Al₂O₃), red variety colored mainly by chromium

AI-generated identification · may be incorrect

Mohs hardness 9; deep red, vitreous luster, trigonal crystal structure. The image shows a step-cut stone, but color and appearance alone cannot confirm natural ruby or distinguish it from synthetic corundum or imitation glass.

Identified September 29, 2026More gemstone →

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At a glance

Common name: Faceted red gemstone, likely ruby
Scientific name: Corundum (Al₂O₃), red variety colored mainly by chromium
Category: gemstone
Identified: September 29, 2026
Method: Standard

AI Estimated Value

Highly variable: glass or imitation stones may be under $10; synthetic rubies often cost a few dollars to tens of dollars, while natural rubies range from tens to thousands or more depending on quality and certification.

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 when aluminum-rich rocks crystallize under high temperature and pressure, often in metamorphic marble or basalt-related deposits. Corundum spans geological ages; the image cannot establish this stone’s origin or age.

Uses & applications

Used in jewelry and, in synthetic form, precision bearings, lasers, and watch components.

Geological facts

Ruby and sapphire are both varieties of corundum; chromium gives ruby its red color.

Field identification & locations

Confirm identity with gemological tests such as refractive index, inclusions, and spectroscopy; common sources include Myanmar, Mozambique, Sri Lanka, and Thailand. A photo cannot establish whether this is natural, synthetic, or an imitation.