gemstone

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium; identity cannot be confirmed from the photo

AI-generated identification · may be incorrect

Small oval, faceted or cabochon-like polished red stone with vitreous luster. If ruby, hardness is 9 Mohs and its crystal structure is trigonal; the image does not establish whether it is natural, synthetic, or glass imitation.

Identified October 4, 2026More gemstone →

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Physical properties

Formation & geological history

Natural ruby forms in metamorphic rocks or some igneous settings; geological ages vary widely. The pictured cut stone gives no evidence of its origin or age.

Uses & applications

Ruby is used in jewelry and, synthetically, in lasers and precision components.

Geological facts

Ruby and sapphire are varieties of the same mineral, corundum; red color distinguishes ruby.

Field identification & locations

A gemological test is needed to distinguish ruby from other red gems or imitation material; inspect inclusions and confirm refractive properties with suitable instruments. Rubies occur notably in Myanmar, Mozambique, Sri Lanka, and Madagascar.