gemstone

Red cabochon gemstone, likely carnelian or dyed chalcedony

Chalcedony (microcrystalline quartz), SiO₂; exact identification requires testing

AI-generated identification · may be incorrect

Translucent reddish-orange, vitreous to waxy luster, non-cleavable, cryptocrystalline quartz; Mohs hardness 6.5–7 and specific gravity about 2.6. The smooth teardrop cabochon and unusually vivid color suggest possible dye treatment; the setting is metal.

Identified August 10, 2026More gemstone →

Explore Red cabochon gemstone, likely carnelian or dyed chalcedony in the encyclopedia →

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Physical properties

Formation & geological history

Carnelian forms when silica-rich fluids deposit chalcedony in volcanic cavities and fractures, commonly during the Cenozoic or older geological periods. Dyed chalcedony is human-processed and may imitate natural red carnelian.

Uses & applications

Used in rings, beads, carvings, and inexpensive-to-moderate jewelry; durable enough for everyday wear but vulnerable to abrasion and strong impacts.

Geological facts

Natural carnelian ranges from orange to brownish-red, with color often caused by iron oxides. Uniformly intense red color and concentration in fractures or edges can indicate dyeing.

Field identification & locations

Identify with a loupe for banding, inclusions, or dye concentration; quartz hardness, refractive index, and specific gravity testing can distinguish it from glass or plastic. Common sources include India, Brazil, Uruguay, Madagascar, and Germany.