gemstone

Milky chalcedony cabochon ring

Chalcedony, microcrystalline quartz (SiO₂), likely white or pale agate variety

AI-generated identification · may be incorrect

The oval cabochon appears translucent cream-white with a waxy-to-vitreous luster and no visible cleavage; quartz hardness is about 6.5–7 Mohs, with specific gravity near 2.60. The surrounding bead-like accents and setting are metal, not part of the specimen.

Identified September 19, 2026More gemstone →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich groundwater fills cavities and fractures in volcanic or sedimentary rocks, commonly through repeated deposition. Its formation ages range from relatively young deposits to ancient rock systems, depending on locality.

Uses & applications

Used extensively for rings, cabochons, beads, carvings, and ornamental objects; it is durable enough for everyday jewelry but may scratch softer metals and stones.

Geological facts

Chalcedony is a cryptocrystalline quartz aggregate composed chiefly of intergrown quartz varieties, commonly quartz and moganite. Creamy material may also be marketed as white agate or milk chalcedony.

Field identification & locations

Identify it by its even color, translucent edges, waxy luster, and lack of cleavage; a steel file should not easily scratch it, while quartz can scratch glass. Common sources include Brazil, India, Madagascar, Uruguay, and the United States.