JewelStop 925 Sterling Silver 1.1 mm Box Chain Necklace, Lobster Claw Clasp - 20" JewelStop box chain necklace that has been beautifully designed. The box chain necklace has been crafted in 925 sterling silver. The necklace is silver in color. The box chain necklace has an unlimited 1 year warranty and 30 days money back guarantee. The product dimensions are: 20" long and 1.1mm in width.