Unique Faceted Onyx Beaded Necklace with Swarovski Crystals. This 18" beaded necklace is a true sparkler, from the faceted Onyx Beads to the inlaid Swarovski Crystal this necklace can make an outfit into a showstopper! The closure is a lobster clasp, the necklace has 1-3/4" of additional silver rings allowing versatility in length.. The Faceted Onyx beads are 12mm in width and the larger Polished Onyx beads with hand inlaid Swarovski Crystals are 20mm. This piece was designed by Marianna and Richard.