gemstone

Dark green faceted gemstone ring

Likely green tourmaline (dravite/elbaite) or green glass imitation; visual identification is inconclusive

AI-generated identification · may be incorrect

The oval, faceted stone appears dark green-black with vitreous luster in a metal setting. If tourmaline, hardness is 7–7.5 Mohs, trigonal crystal structure, and no obvious cleavage; color and inclusions require testing for confirmation.

Identified August 27, 2026More gemstone →

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At a glance

Common name: Dark green faceted gemstone ring
Scientific name: Likely green tourmaline (dravite/elbaite) or green glass imitation; visual identification is inconclusive
Category: gemstone
Identified: August 27, 2026
Method: Standard

AI Estimated Value

Approximately $10–$75 for costume jewelry or imitation; $100–$2,000+ if confirmed as a quality natural green tourmaline ring.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Green tourmaline forms in granitic pegmatites and metamorphic rocks, crystallizing mainly during the late stages of magma cooling; deposits range from Precambrian to younger ages. A glass imitation is manufactured and has no geological formation history.

Uses & applications

Used as a jewelry gemstone and collector specimen; tourmaline is commonly cut into cabochons or faceted stones. Value depends strongly on natural identity, transparency, color, treatment, carat weight, and workmanship.

Geological facts

The photograph cannot reliably distinguish tourmaline from dark sapphire, emerald, diopside, quartz, or colored glass. Refractometer, specific-gravity, microscope, and laboratory spectroscopy testing are recommended.

Field identification & locations

Look for strong pleochroism, elongated inclusions, and tourmaline-like growth features; avoid scratch tests on jewelry. Common sources include Brazil, Afghanistan, Pakistan, Namibia, Nigeria, and the United States.