SWAROVSKI ELEMENTS 5mm 5328 XILION bead. The XILION Bead is the most popular bead shape that we sell, it replaces the 5301 Bicone bead which Swarovski have transformed into the new patented 5328 shape: It features 50% more facets for extra brilliance and light refraction, a smoother equator for increased comfort during wearing and rounded hole edges to protect stringing materials. The hole size is approximately 1mm, they are available in 39 different colours. 5328 is also available in 3mm, 4mm, 6mm & 8mm. These 5mm Swarovski crystal beads are incredibly versatile and work well in almost any project they are ideal for tiaras.