gemstone
Carnelian Ring
SiO2 (Variety of Chalcedony)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, reddish-orange to brown color, vitreous to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no cleavage, and a specific gravity around 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, reddish-orange to brown color, vitreous to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no cleavage, and a specific gravity around 2.60 to 2.65.
Formation & geological history
Forms in low-temperature hydrothermal environments, cavities of volcanic rocks, and sedimentary strata by the deposition of silica from groundwater rich in iron oxide impurities.
Uses & applications
Extensively used in fine jewelry, rings, talismans, signet rings, carvings, and ornamental lapidary work.
Geological facts
Carnelian has been prized since ancient times, frequently used in ancient Egypt as amulets for the afterlife and in Roman times for wax seal rings because hot wax does not stick to it.
Field identification & locations
Easily identified by its translucent reddish-orange hue and waxy luster; commonly sourced from India, Brazil, Uruguay, and Madagascar.
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