gemstone

Polished orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

AI-generated identification · may be incorrect

Smooth, rounded, translucent-to-opaque orange surface with a waxy to vitreous luster; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The photo does not establish whether this is natural stone or an imitation.

Identified October 12, 2026More gemstone →

Explore Polished orange chalcedony (likely carnelian) in the encyclopedia →

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Physical properties

Formation & geological history

Chalcedony forms as silica precipitates in cavities and fractures, commonly in volcanic rocks; its geological age varies widely. Orange color usually comes from iron impurities or heat treatment.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; this small polished piece is primarily a jewelry or collecting material.

Geological facts

Carnelian has been used for seals and jewelry since antiquity. Its color and translucency can overlap with dyed agate, glass, and other orange stones.

Field identification & locations

Look for subtle color banding, natural inclusions, and a cool feel; glass may show bubbles, while a hardness or scratch test can damage the specimen. Chalcedony occurs worldwide, including Brazil, India, Uruguay, and the United States.