gemstone

Green agate/chalcedony bead necklace

Microcrystalline quartz (SiO₂), likely green chalcedony or dyed green agate

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent to opaque dark green, vitreous/waxy luster, cryptocrystalline quartz with no visible cleavage. The beads are polished and faceted, with gold-colored spacer beads and metal fittings.

Identified August 16, 2026More gemstone →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich fluids fill cavities and fractures, commonly in volcanic rocks; agate develops through banded silica deposition. Geological ages vary widely, and the green color may be natural (often from chlorite or nickel-bearing minerals) or enhanced by dyeing.

Uses & applications

Used primarily in jewelry and ornamental beads; chalcedony is durable enough for everyday wear but may scratch from harder materials.

Geological facts

The image cannot confirm whether the color is natural or dyed; strong, unusually uniform green often indicates treatment. Quartz-rich chalcedony has a glassy-to-waxy appearance rather than the granular texture of greenstone.

Field identification & locations

Identify by its smooth waxy luster, hardness, translucency, and possible subtle banding; check drill holes for concentrated dye. Common sources include Brazil, India, Madagascar, Uruguay, and African deposits.