gemstone

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

AI-generated identification · may be incorrect

Translucent orange-red, smooth and polished, with waxy to glassy luster and no visible cleavage. Mohs hardness 6.5–7; specific gravity about 2.60–2.65; cryptocrystalline structure.

Identified August 14, 2026More gemstone →

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At a glance

Common name: Tumbled carnelian (orange chalcedony)
Scientific name: Carnelian, a microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
Category: gemstone
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small tumbled stone; $10–$50 for attractive larger natural pieces. High-quality carved or strongly banded material can cost more; this specimen appears low-value unless proven natural and exceptional.

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

Translucent orange-red, smooth and polished, with waxy to glassy luster and no visible cleavage. Mohs hardness 6.5–7; specific gravity about 2.60–2.65; cryptocrystalline structure.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, later acquiring its orange color from iron. It is generally associated with Cenozoic and older volcanic or sedimentary deposits.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive jewelry. Small tumbled pieces are usually decorative rather than highly valuable.

Geological facts

The photograph strongly resembles dyed or natural carnelian; color alone cannot confirm which. Natural specimens often show subtle bands, cloudy zones, or uneven translucency.

Field identification & locations

Commonly found in India, Brazil, Uruguay, Madagascar, Germany, and the United States. Check for glass-like hardness, translucency at the edges, and absence of bubbles; a gemological test is needed to distinguish dyed chalcedony or glass.