JewelStop Sterling Silver Classic Domed Rhodium Omega 4 mm Necklace, Lobster Claw Clasp - 18", 16.6gr. Crafted In Sterling Silver Pomegarly Stamped And Marked JewelStop omega chain necklace that has got a stunning design. The necklace is silver in color. The omega chain necklace has an unlimited 1 year warranty and 30 days money back guarantee. The product dimensions are: 18" long and 4mm in width.