gemstone

Blue chalcedony or blue quartz bead bracelet

Microcrystalline quartz, SiO₂ (chalcedony); possibly treated blue quartz

AI-generated identification · may be incorrect

Blue, translucent to semi-transparent, vitreous-to-waxy luster, rounded polished beads; quartz hardness 7 Mohs, trigonal crystal structure, no cleavage, specific gravity about 2.6. The vivid uniform color may indicate dyeing or treatment.

Identified August 19, 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; quartz deposits range from ancient to modern geologic ages. Blue material is associated with regions including Madagascar, Brazil, Turkey, and the United States.

Uses & applications

Used for beads, cabochons, carvings, and ornamental jewelry; durable enough for everyday wear but can scratch softer gems.

Geological facts

Chalcedony is a variety of quartz composed of microscopic intergrowths of quartz fibers. Natural blue chalcedony is typically softly colored and cloudy, while strongly saturated blue beads are often dyed or mislabeled blue quartz/aquamarine.

Field identification & locations

Identify by hardness, lack of cleavage, waxy luster, and quartz-like durability; a scratch test should be avoided on finished jewelry. Magnification may reveal dye concentration in cracks or drill holes.