gemstone

Polished yellow chalcedony pendant (possibly yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

AI-generated identification · may be incorrect

Opaque to translucent pale yellow with a waxy-to-vitreous luster and smooth polished surface; quartz crystal structure, Mohs hardness 6.5–7, no obvious cleavage. The photo does not reveal distinctive banding, so exact identification is uncertain.

Identified October 2, 2026More gemstone →

Explore Polished yellow chalcedony pendant (possibly yellow agate) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids deposit microscopic quartz in cavities or fractures, often in volcanic rocks; the specimen’s geological age and source cannot be determined from the image.

Uses & applications

Used for pendants and other jewelry, as well as ornamental carvings and collectibles.

Geological facts

Yellow chalcedony is sometimes sold as yellow agate, though agate commonly has visible banding; color may also be enhanced by treatment.

Field identification & locations

A polished, uniformly colored teardrop-shaped stone is consistent with chalcedony. Confirming the variety or detecting treatment requires examination and testing; chalcedony occurs worldwide, including Brazil, India, and Uruguay.