This elegant necklace is made with genuine Clear AB Swarovski Crystals. The AB (Aurora Borealis) gives an iridescent quality to the crystals as they gently reflect the colors around them. They are accented crystal rondelles that sparkle like diamonds. The fabulous faceted Swarovski center bead is 12mm. The length is adjustable from 16" to 18" with the extender. The clasp is an easy to use Lobster.