gemstone

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored

AI-generated identification · may be incorrect

Smooth polished cabochon with orange-red color and vitreous-to-waxy luster; likely Mohs 6.5–7 if carnelian, with no visible cleavage and cryptocrystalline structure. The perfectly uniform appearance could also indicate dyed chalcedony or synthetic/man-made glass, which cannot be confirmed from the image.

Identified September 4, 2026More gemstone →

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Physical properties

Formation & geological history

Natural carnelian forms when iron-bearing silica fills cavities and fractures, commonly in volcanic rocks; deposits occur in India, Brazil, Uruguay, Madagascar, and elsewhere. Chalcedony formed in the Cenozoic and older geological settings, depending on locality.

Uses & applications

Used for beads, cabochon jewelry, carvings, seals, and ornamental objects; common-quality pieces have modest value.

Geological facts

Carnelian’s red-orange color results mainly from iron oxides. It is traditionally associated with ancient Egyptian, Roman, and Islamic seals and amulets.

Field identification & locations

Test cautiously with hardness, refractive index, and magnification: natural carnelian commonly shows subtle cloudy banding or inclusions, while glass may show bubbles and conchoidal fractures. Typical value is about $5–$30 for a small commercial cabochon, or $30–$150 for fine natural material.