Swarovski® 4mm Siam Shimmer Bicone Crystal Beads Style #5328. This bicone shaped bead is by far one of the most popular shapes. It tapers at both ends, much like a diamond. The multiple facets cut into the surface of the crystal creating a sparkling effect. This versatile bead can be used in necklaces, bracelets, earrings and much more. Sold individually.