gemstone

Green glassy cabochon, likely dyed or synthetic material

Uncertain; possibly green obsidian, chrysoprase, or synthetic glass

AI-generated identification · may be incorrect

Highly polished oval cabochon with dark emerald-green color, translucent edges, and glassy luster. Hardness is uncertain: obsidian/glass is about 5–5.5 Mohs, chrysoprase 6.5–7; no visible crystal structure or cleavage.

Identified August 12, 2026More gemstone →

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Physical properties

Formation & geological history

The image does not establish a natural geological identity. If obsidian, it formed as rapidly cooled volcanic lava, generally during the Quaternary; if chrysoprase, it formed as nickel-bearing chalcedony in weathered ultramafic rocks. Internal swirls and strong uniform color may indicate dyeing or synthetic glass.

Uses & applications

Used as a decorative cabochon in jewelry and lapidary collections. Comparable green glass or dyed stone has modest value; natural high-quality chrysoprase can be more valuable.

Geological facts

The smooth domed shape is a cut-and-polished cabochon, not a natural crystal face. A gemological refractive-index, specific-gravity, and hardness test is needed for reliable identification.

Field identification & locations

Check for round gas bubbles, flow lines, or conchoidal fractures (glass/obsidian); chrysoprase commonly shows cloudy, waxy translucence rather than strongly glassy transparency. Avoid scratching the surface; test under magnification and with professional instruments.