gemstone

Yellow chalcedony cabochon ring

Microcrystalline quartz (SiO₂), likely yellow chalcedony or dyed/treated chalcedony

AI-generated identification · may be incorrect

Opaque to translucent lemon-yellow cabochon with a waxy-to-glassy luster; quartz hardness is about Mohs 7, trigonal crystal structure, no cleavage, and specific gravity around 2.6. The smooth oval setting and intense uniform color suggest polishing and possibly dyeing or heat treatment.

Identified September 11, 2026More gemstone →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; formation ages range from recent to Paleozoic. The photograph alone cannot establish its geological age or distinguish natural yellow chalcedony from treated material.

Uses & applications

Used in jewelry as a durable cabochon and ornamental stone; chalcedony is also used for carvings and decorative objects. The metal appears to be a silver-colored setting, but its identity cannot be confirmed visually.

Geological facts

Natural yellow chalcedony is less common than gray, blue, or orange varieties; similarly colored materials may include chrysoprase, citrine, dyed agate, or opaque glass. No crystal faces are visible because it is cut and polished.

Field identification & locations

Field identification requires hardness testing, specific gravity, magnification, and refractive-index or spectroscopic testing; avoid scratching the mounted stone. Common chalcedony sources include Brazil, Uruguay, India, Madagascar, and the United States.