gemstone

Gray agate (chalcedony) bead bracelet

Agate, a banded variety of chalcedony (microcrystalline quartz, SiO₂)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; gray to blue-gray, translucent with subtle banding and a waxy-to-vitreous luster. Trigonal quartz; no obvious cleavage, with conchoidal fracture. The beads are cut and polished.

Identified September 26, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids deposit chalcedony in cavities and fractures, commonly in volcanic rocks. Its age depends on the host geology; the pictured bracelet does not reveal a specific source or age.

Uses & applications

Used for beads, jewelry, carvings, and ornamental objects; this piece is wearable fashion jewelry.

Geological facts

Agate’s fine-scale bands can form as successive silica layers, though banding may be faint or absent in gray varieties.

Field identification & locations

Identify by its silica hardness, translucency, waxy luster, and any curved bands; common sources include Brazil, Uruguay, India, and the United States. The image shows polished, faceted gray beads, but exact identification and provenance cannot be confirmed visually.