This essential round box chain necklace is made from 18K Yellow gold with rhodium finish for extra protection. It is secured with a lobster clasp. This necklace is tarnish-resistant. It does not flake off, lose luster or discolor. It is waterproof, you don't need to take it off in your daily life, you can take a bath or swim with it. We offer necklaces of 16 inches to 32inches in length and 2mm/3mm/4mm width for this model. *** Free Gift Packaging Included.