gemstone
Smoky quartz ring
Quartz, SiO₂ (likely smoky quartz)
AI-generated identification · may be incorrectTranslucent gray-brown cabochon with vitreous luster; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The setting appears to be metal; the stone’s identity is uncertain from the image alone.
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Physical properties
Translucent gray-brown cabochon with vitreous luster; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The setting appears to be metal; the stone’s identity is uncertain from the image alone.
Formation & geological history
Quartz forms in silica-rich igneous and hydrothermal environments; smoky coloration commonly results from natural irradiation of trace aluminum in the crystal. Quartz occurs in rocks of many geological ages.
Uses & applications
Used as jewelry and as a collector gemstone; quartz also has extensive industrial uses in glass, electronics, and abrasives.
Geological facts
Smoky quartz’s color ranges from pale gray to nearly black and can fade with prolonged strong sunlight.
Field identification & locations
A domed cabochon and smoky coloration suggest smoky quartz, but glass or another stone cannot be ruled out visually. It is commonly found in granite pegmatites and hydrothermal veins, including in Brazil, Scotland, and the Alps.
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