SWAROVSKI ELEMENTS 4mm 5040 Briolette bead. These crystal beads have 48 precision cut facets over their doughnut shaped body. Crystal AB is also available in a 6mm and 8mm sizes. The hole is approximately 0.9mm in size. These 4mm Swarovski Crystal Briolette beads sparkle intensely and look fabulous in bracelets. Crystal AB is crystal with a coating on one half that reflects light with a yellow, pink and blue tinge, like the surface of a bubble.