gemstone

Tumbled carnelian (orange chalcedony)

Carnelian, a cryptocrystalline variety of quartz (SiO₂), colored mainly by dispersed iron oxides

AI-generated identification · may be incorrect

Typically translucent orange to reddish-orange with a waxy to glassy luster; hardness 6.5–7 Mohs, no visible crystal faces, conchoidal fracture, and specific gravity about 2.6. The smooth rounded shape indicates tumbling and polishing.

Identified August 31, 2026More gemstone →

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At a glance

Common name: Tumbled carnelian (orange chalcedony)
Scientific name: Carnelian, a cryptocrystalline variety of quartz (SiO₂), colored mainly by dispersed iron oxides
Category: gemstone
Identified: August 31, 2026
Method: Standard

AI Estimated Value

$2–$15 for a small common tumbled stone; $20–$100+ for larger, strongly colored, naturally patterned or well-polished pieces

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

Forms when silica-rich groundwater fills cavities and fractures, with iron impurities producing the orange color; commonly associated with volcanic rocks and ancient sediments. Deposits range from Precambrian to recent geological ages.

Uses & applications

Used for beads, cabochons, carvings, seals, and ornamental objects; durable enough for everyday jewelry. Common tumbled pieces have modest value.

Geological facts

Carnelian is closely related to sard, with color determined largely by iron content and heat treatment. Ancient Egyptians and Romans widely used it in amulets and engraved seals.

Field identification & locations

Found commonly in India, Brazil, Uruguay, Madagascar, and Germany. Identify it by its orange-red translucent body, uniform waxy appearance, quartz hardness, and lack of cleavage; this specimen’s exact identity is image-based.