SWAROVSKI CRYSTAL 4mm 5328 XILION Bicone Beads. The new 4mm 5328 XILION bead was developed to replace the discontinued 4mm 5301 bicone bead, boasts of the revolutionary XILION cut. It promises a distinctively higher brilliance, more fire and greater light reflection with its alternating large and smaller facets. The increased number of facets promises an overall enhancement while the rounder belt line will result in improved and longer wearing comfort of finished projects. SWAROVSKI CRYSTAL ELEMENTS.