These small 3mm crystal beads have a .8mm hole with a rounded edge to reduce wear on your stringing material. These crystal glass beads are perfect for dash of color in a necklace design or bracelet project Swarovski's brand of Austrian crystal is famed for its precision shape and brilliant color. The Black Diamond Bicone Beads create a transparent grey shade adding mystery and suspense to your jewelry designs. Adding these Swarovski Bicone Beads to your next jewelry project creates an unmistakable sign of authenticity and elegance.