gemstone

Gray chalcedony (likely gray agate) bracelet

Chalcedony, microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

The cabochons appear translucent gray with a waxy-to-vitreous luster and are set in metal. Quartz has Mohs hardness 7 and a trigonal crystal structure, though chalcedony’s microscopic crystals are not individually visible; cleavage is absent and fracture is typically conchoidal.

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich fluids deposit in cavities and fractures, commonly in volcanic rocks. The image cannot establish the stones’ geological age or exact variety.

Uses & applications

Used for cabochon jewelry and decorative objects; the bracelet’s gold-colored setting may be plated rather than solid gold.

Geological facts

Gray chalcedony can be difficult to distinguish visually from other translucent gray materials; identification may require gemological testing.

Field identification & locations

Look for a smooth, even waxy sheen and translucent edges; confirm with hardness, refractive-index, or microscopic testing. Chalcedony occurs worldwide, including Brazil, India, Turkey, and the United States.