gemstone

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture, and specific gravity around 2.60 to 2.65. This particular specimen has been artificially dyed vibrant blue and purple.

Identified August 6, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms primarily within cavities of volcanic and metamorphic rocks through the slow deposition of silica-rich groundwater over millions of years. The bright unnatural colors are the result of post-harvest commercial dye treatments.

Uses & applications

Commonly used in jewelry, lapidary arts, decorative items, and as tumbled stones for the metaphysical and crystal collecting markets.

Geological facts

Natural agates are known for their fine grain and bright concentric banding. The practice of dyeing agate dates back to ancient Roman times, typically utilizing porous chalcedony to absorb mineral and organic dyes.

Field identification & locations

Readily identified by its conchoidal fracture, wax-like luster, and Mohs hardness capable of scratching glass. Vibrant, neon-like colors such as bright blues, purples, and pinks strongly indicate artificial dyeing, as these colors rarely occur naturally in such saturation.

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