18kt Gold Filled Ying Yang Necklace on 4mm Herringbone Chain Length: 14",16" & 18" Options Quality: Excellent, Non-Tarnish/Water Resistant Jewelry . . . Jewelry Care: As with all pieces that are not real gold, it is advised that you take proper jewelry care by not exposing to any harsh chemicals & taking off jewelry before going in the sea. This quality is excellent & can at least as long as there is proper care. Dainty Yin Yang Necklace, Yin Yang, Yin Chain, Yin Layering Chain, Gift For Her, Yin Pendant, Gift Wife