gemstone

Green chalcedony cabochon (possibly dyed agate)

Chalcedony, microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Opaque to slightly translucent dark green, polished oval cabochon with a waxy-to-glassy luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage. The image alone cannot confirm whether the color is natural or enhanced.

Identified October 11, 2026More gemstone →

Explore Green chalcedony cabochon (possibly dyed agate) in the encyclopedia →

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Physical properties

Formation & geological history

Silica-rich fluids deposit microscopic quartz in cavities and veins, commonly in volcanic rocks; formation ages vary widely. Green color may come from trace minerals or dye treatment.

Uses & applications

Used in cabochon jewelry, beads, and ornamental objects; value depends on naturalness, color, workmanship, and size.

Geological facts

Chalcedony is a cryptocrystalline form of quartz, so its crystals are too small to distinguish unaided.

Field identification & locations

Look for a uniformly smooth, waxy surface and hardness sufficient to scratch glass; natural color often has subtle variation, while dye may pool in cracks. Chalcedony occurs worldwide, including Brazil, India, Madagascar, and the United States.