gemstone

Blue chalcedony (likely dyed or assembled cabochon)

Microcrystalline quartz, SiO₂ (chalcedony)

AI-generated identification · may be incorrect

Polished, translucent white/gray chalcedony surrounding a vivid blue center, with rounded circular inclusions or bead-like features. Quartz hardness is about 6.5–7 Mohs, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage, and specific gravity near 2.6;…

Identified August 14, 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. Blue material may be naturally colored by inclusions, but this intense pattern is also typical of dyed, assembled, or decorative agate/chalcedony; age depends on its host deposit.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; commercial value is generally modest unless color and pattern are unusually natural and attractive.

Geological facts

The circular “eyes” and saturated blue center suggest a manufactured or strongly treated gemstone rather than a typical untreated specimen. The regional prior near 45.5°N, 122.5°W is compatible with volcanic-hosted chalcedony and agate from the Cascades/Columbia River region.

Field identification & locations

Check with a loupe for dye concentration in cracks or drill holes, bubbles, and sharp assembly boundaries. A hardness test, refractive index, and examination under magnification can distinguish chalcedony from glass or resin.