Jenaforte Sterling Silver Medium Cubic Zirconia Disk Necklace 16" + 2" Extension .925 Sterling silver, Nickel-free guarantee. Available on Rhodium, Gold Plated finish. CZ pave disk (17mm) necklace 16" + 2"extension. Adjustable Length from 16" to 18" Made in the U.S.A. by master jewelry craftsmen.