gemstone

Mixed polished gemstone bead bracelet, likely tourmalinated quartz and rhyolite/jasper

Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) and probable feldspar-rich rhyolite/jasper

AI-generated identification · may be incorrect

Polished spherical beads show translucent gray, pink, brown, and green tones with dark needle-like or dendritic inclusions. Quartz hardness is 7 Mohs with vitreous luster; included rhyolite/jasper is typically 6–7, opaque to weakly translucent, and fine-grained.

Identified September 14, 2026More gemstone →

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At a glance

Common name: Mixed polished gemstone bead bracelet, likely tourmalinated quartz and rhyolite/jasper
Scientific name: Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) and probable feldspar-rich rhyolite/jasper
Category: gemstone
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a common bracelet; $50–$150 if beads are confirmed high-grade tourmalinated quartz or another desirable gemstone.

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

Quartz-tourmaline material forms in hydrothermal veins and granitic pegmatites, while rhyolite/jasper forms from volcanic silica-rich rocks or silicified fluids. Ages vary widely, commonly millions to billions of years.

Uses & applications

Used as decorative beads, jewelry, and spiritual/collectible stones; not typically used structurally or industrially in this form.

Geological facts

The dark inclusions may be schorl tourmaline, manganese-oxide dendrites, or other iron-rich minerals; bead polish and lighting make precise identification uncertain.

Field identification & locations

Identify by hardness, translucency, glassy luster, and inclusions; a streak, magnification, and refractive-index test would separate quartz from jasper or rhyolite. Similar material occurs worldwide, including Brazil, Madagascar, India, and the United States.