Tourmalinated Quartz Faceted Rondelles measure approximately 2.5mm average in diameter, have a vitreous luster, excellent polish, the shapes are symmetrical, gems show Black Tourmaline needles throughout the strand within a milky quartz body, and tourmalinated quartz beads are transparent crystal quartz body colored by the black needles for a wonderful value. Bead diameters may vary slightly on the strand from 2.5mm to 2.8mm.