16"+1" Cubic Zirconia Necklace in Sterling Silver. Showcasing sparkling 4mm round cubic zirconia, this timeless style is perfect for any occasion. Wear on 16"+1" Cubic Zirconia Necklace in Sterling Silver. Showcasing sparkling 4mm round cubic zirconia, this timeless style is perfect for any occasion. Wear on it's own for a classic statement, or layer it with your other necklaces and chains. Cleaning and Care To prevent/remove tarnish, polish pieces regularly using a non-abrasive cleaning cloth. If needed, use a liquid silver polish with a soft, smooth cloth. Do not polish gemstones or pearls with silver polish. Storing pieces in individual chamois or zip-lock bags can prevent tarnishing.