gemstone

Green gemstone cabochon, likely chrysoprase

Chrysoprase: microcrystalline chalcedony, SiO₂, colored mainly by nickel-bearing minerals

AI-generated identification · may be incorrect

Translucent apple-green, waxy to vitreous luster, cryptocrystalline quartz, no visible cleavage; Mohs hardness 6.5–7, specific gravity about 2.58–2.64. The smooth oval cabochon and strong green color indicate a polished specimen.

Identified August 18, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when nickel-rich fluids alter ultramafic rocks, depositing chalcedony in fractures and cavities; commonly Cenozoic to relatively young hydrothermal/weathering deposits. The photograph alone cannot establish exact age or confirm the identity.

Uses & applications

Used for cabochon jewelry, beads, carvings, and lapidary collecting; attractive saturated material may be commercially valuable.

Geological facts

Chrysoprase is the best-known green variety of chalcedony and historically was used in seals and ornamental objects. Similar materials include dyed green agate, prase, jade, and glass.

Field identification & locations

Common sources include Australia, Poland, Brazil, Tanzania, and Kazakhstan. Identify natural chrysoprase by its even apple-green translucent body, quartz hardness, and lack of bubbles; microscopy, spectroscopy, or testing is needed to exclude dyed agate or glass.