gemstone

Gemstone bead necklace, likely mixed tourmaline and quartz

Probable schorl/dravite tourmaline with quartz or smoky quartz; exact identification requires testing

AI-generated identification · may be incorrect

Polished, faceted beads show black, brown, amber, green, and smoky translucent colors with vitreous luster. Tourmaline hardness is 7–7.5 Mohs; quartz is 7; crystals are trigonal and lack prominent cleavage, while metal spacers and cord are non-geological components.

Identified August 16, 2026More gemstone →

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At a glance

Common name: Gemstone bead necklace, likely mixed tourmaline and quartz
Scientific name: Probable schorl/dravite tourmaline with quartz or smoky quartz; exact identification requires testing
Category: gemstone
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Approximately $20–$150 for a mixed commercial strand; $200–$1,000+ if confirmed as high-quality natural tourmaline.

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

Natural tourmaline and quartz formed in hydrothermal veins, pegmatites, and metamorphic rocks, commonly during Precambrian to Phanerozoic geological events. The beads have been cut, polished, drilled, and assembled into jewelry.

Uses & applications

Used primarily as decorative jewelry and collectible gemstone material; tourmaline is also valued for its strong piezoelectric and pyroelectric properties.

Geological facts

Color zoning and strong translucency are characteristic of tourmaline, but the image alone cannot distinguish it reliably from glass, agate, onyx, or other stones.

Field identification & locations

Check for natural inclusions, color zoning, cool stone feel, and hardness against glass; a gemological refractive-index or spectroscopy test is more reliable. Common sources include Brazil, Afghanistan, Pakistan, Africa, and the United States.