gemstone

Carnelian (reddish chalcedony) with iron-stained host rock

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

AI-generated identification · may be incorrect

The foreground piece is translucent reddish-orange to brown, with a waxy-to-glassy luster and no obvious cleavage; quartz hardness is about 6.5–7 Mohs and specific gravity about 2.58–2.65. The attached matrix appears porous, brecciated, and strongly iron-oxide stained, possibly weathered volcanic or sedimentary materia…

Identified September 10, 2026More gemstone →

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At a glance

Common name: Carnelian (reddish chalcedony) with iron-stained host rock
Scientific name: Chalcedony, microcrystalline quartz (SiO₂), colored mainly by iron oxides
Category: gemstone
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small common rough specimen; $30–$150+ for attractive polished or well-colored pieces, depending on size and provenance.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Carnelian forms when silica-rich fluids fill cavities and fractures, with iron impurities producing the red-orange color; associated host rock may be much older than the vein. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; attractive lapidary-grade pieces commonly have moderate value.

Geological facts

Carnelian is a translucent variety of chalcedony and grades into sard when darker brown-red. Color may intensify after heating, a common treatment in the gemstone trade.

Field identification & locations

Identify it by its red-orange translucency, smooth waxy surface, conchoidal fracture, and lack of cleavage; it should scratch glass but not be scratched by a steel blade. Common sources include India, Brazil, Uruguay, Madagascar, and Germany.