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Gorgeous Genuine Black Spinel Gemstones. Faceted Rondelles. Coated For Extra Luster. 3mm - 3.5mm Diameter. 13 Inch Strand / Approximately 160 Beads. Black Spinel has a superior hardness when compared to other black stones like Onyx or Hematite. These small rondelles are faceted, then coated for extra luster. They look stunning when spaced between just about any color gemstone. Try with white pearls for real contrast. Beads measure approximately 3mm to 3.5mm in diameter. 2mm to 2.5mm thick (along string.) Temporarily strung, hole is less than 1mm. Strand is 13 inches and contains approximately 160 beads.