gemstone

Likely polished chalcedony or agate cabochon pendant

Microcrystalline quartz, SiO₂ (chalcedony/possibly banded agate)

AI-generated identification · may be incorrect

Smooth oval cabochon with translucent cream-yellow color and a subtle horizontal band; vitreous to waxy luster, no visible crystal faces or cleavage, Mohs hardness about 6.5–7, specific gravity ~2.6. The metal setting and chain are non-geological accessories.

Identified August 15, 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; agate banding develops through repeated silica deposition. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Used for cabochon jewelry, ornaments, and collectible lapidary pieces; chalcedony is durable and polishes well.

Geological facts

The pale yellow color may result from iron staining or gentle heat treatment; a perfectly uniform appearance can also indicate dyed or treated material. It is not possible to distinguish chalcedony from some look-alike glass or resin with certainty from the image alone.

Field identification & locations

Field identification: test hardness against glass, inspect for curved internal flow lines or bubbles (glass), and look for natural fine banding. Common sources include Brazil, Uruguay, India, Madagascar, and the United States.