gemstone

Tumbled turquoise-colored agate or chalcedony

Cryptocrystalline quartz (SiO₂), possibly dyed chalcedony; exact identification requires testing

AI-generated identification · may be incorrect

Translucent blue-green body with cloudy beige inclusions and a waxy-to-glassy luster, typical of polished chalcedony. Quartz hardness is about 6.5–7 Mohs, with no visible cleavage and a microcrystalline structure; the strong color may be artificial.

Identified September 10, 2026More gemstone →

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At a glance

Common name: Tumbled turquoise-colored agate or chalcedony
Scientific name: Cryptocrystalline quartz (SiO₂), possibly dyed chalcedony; exact identification requires testing
Category: gemstone
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common tumbled or dyed piece; $20–$75 if confirmed natural, vividly colored, and high quality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; deposits range from Paleozoic to Cenozoic in age. The specimen has been cut and tumbled, and its blue-green color may result from dye treatment rather than natural formation.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; attractive tumbled pieces have modest jewelry and collector value.

Geological facts

The rounded shape and polish are human-produced. Dye commonly concentrates in pores, fractures, and surface pits, producing uneven turquoise-blue coloration.

Field identification & locations

Check hardness, translucency, conchoidal fracture, and dye concentration; a streak test, magnification, and refractive-index or spectroscopy testing can distinguish chalcedony from glass or resin. Common sources include Brazil, Uruguay, Madagascar, India, and the United States.