gemstone

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

AI-generated identification · may be incorrect

The ring holds a polished, oval red gemstone in a silver-colored setting. Ruby has Mohs hardness 9, vitreous luster, and a trigonal crystal structure; the stone’s internal features and possible treatments cannot be confirmed from the photo.

Identified September 26, 2026More gemstone →

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Physical properties

Formation & geological history

Rubies form in aluminum-rich, silica-poor metamorphic rocks or in some igneous settings. Natural stones span a wide range of geological ages; origin and age cannot be determined visually here.

Uses & applications

Used in jewelry and as a collectible gemstone; synthetic corundum also has industrial applications.

Geological facts

Ruby is one of the traditional four precious gemstones. Asterism can occur in some rubies, producing a star-like effect when cut as a cabochon.

Field identification & locations

The vivid red color and jewelry cut are consistent with ruby, but glass, synthetic corundum, and treated or composite stones can look similar. Gemological testing is needed to establish identity, natural origin, and treatment.