gemstone

Polished carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Translucent orange-red with a vitreous to waxy luster; Mohs hardness 6.5–7, trigonal quartz structure, no distinct cleavage. The oval cabochon is polished and appears to contain natural inclusions or surface marks.

Identified October 10, 2026More gemstone →

Explore Polished carnelian (red-orange chalcedony) in the encyclopedia →

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Physical properties

Formation & geological history

Forms when silica-rich fluids deposit microcrystalline quartz in rock cavities and fractures; iron compounds impart the orange-red color. Chalcedony occurs in rocks of many geological ages, commonly in volcanic settings.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; durable and affordable for everyday jewelry.

Geological facts

Carnelian is a variety of chalcedony, not a separate mineral species; its color can be enhanced by heating or dyeing.

Field identification & locations

Look for translucent orange-to-red color and a fine, non-granular texture; it is commonly sourced from India, Brazil, Uruguay, and Madagascar. This photo supports a carnelian identification, though treatment and exact material cannot be confirmed visually.