40 Tanzanite Color Bicone Crystal Beads Great For Beading, Craft Projects, Craft Enthusiasts & Making Necklaces, Bracelets & Earrings. This is a new set of 40 beautiful tanzanite color machine cut Swarovski bicone crystal beads. Great for beading, craft projects, craft enthusiasts and making necklaces, bracelets, earrings and other jewelry. These will add flair to any clothing item or jewelry. Each bead measures approximately 4 mm (3/16") in diameter.