gemstone

Dyed or color-enhanced agate/microcrystalline quartz bead

Chalcedony (microcrystalline SiO₂), likely agate

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; rounded polished form with pastel blue-green, cream, and orange zones, waxy-to-vitreous luster, and no visible cleavage. The banding and translucency are consistent with chalcedony, though the vivid colors may be dye or surface treatment.

Identified August 9, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills cavities in volcanic rock, depositing successive layers of chalcedony over long periods, commonly during the Cenozoic or older volcanic episodes. This specimen has been cut, polished, and possibly dyed into a bead.

Uses & applications

Used for beads, carvings, cabochons, ornaments, and inexpensive jewelry; it has little industrial significance in this form.

Geological facts

Agate’s colors commonly arise from iron, manganese, copper, or other trace elements, while artificial treatments can produce unusually bright pastel hues.

Field identification & locations

Look for curved internal banding, translucency at the edges, glass-scratching hardness, and absence of bubbles; regular dye concentration in cracks or pores suggests treatment. Common sources include Brazil, Uruguay, India, Madagascar, and Mexico.