gemstone

Yellow agate (likely dyed chalcedony) pendant

Chalcedony, microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

A polished, translucent yellow sphere with a waxy-to-glassy luster; quartz hardness 6.5–7, trigonal crystal structure, no distinct cleavage, and specific gravity about 2.6. The gold-colored setting and loop are jewelry hardware, not geological material.

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich fluids deposit quartz in cavities and fractures, commonly in volcanic rocks; its formation spans many geological ages. The vivid, uniform yellow may result from dyeing or treatment.

Uses & applications

Used as an ornamental bead or pendant; agate is also used for carvings, beads, and decorative objects.

Geological facts

Chalcedony is a fine-grained variety of quartz; agate is commonly banded, though some pieces show little visible banding.

Field identification & locations

Identify by its hardness, waxy luster, translucency, and possible natural banding; common sources include Brazil, Uruguay, India, and Madagascar. This image alone cannot confirm the stone or treatment.