gemstone

Tumbled rutilated quartz bead strand

Quartz, silicon dioxide (SiO₂), containing needle-like rutile inclusions (TiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent gray, honey, or smoky quartz with golden-brown rutile needles; vitreous luster and trigonal crystal structure, though beads are polished and drilled. Quartz has no cleavage and conchoidal fracture; specific gravity about 2.65.

Identified August 13, 2026More gemstone →

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Physical properties

Formation & geological history

Rutile inclusions crystallize within quartz during hydrothermal or pegmatitic growth, commonly millions to billions of years ago; beads are human-cut and polished. Commercial material is associated with Brazil, Madagascar, Australia, and India.

Uses & applications

Used for necklaces, bracelets, cabochons, and ornamental objects; attractive needle patterns increase jewelry and collector appeal.

Geological facts

Rutilated quartz is valued for sharply defined, abundant, well-oriented golden inclusions; the inclusions can form hairlike sprays or crossed networks.

Field identification & locations

Identify by glassy quartz, rounded hardness-resistant beads, and internal golden needles visible under magnification; beware dyed or merely iron-stained quartz. Common sources include Brazil and Madagascar.