Pieces: 1-piece Material: Platinum-plated, 925 sterling silver, Zircon Care instructions: Avoid wearing during exercise, as sweat will react with the jewelry to produce silver chloride and copper sulfide, which causes the jewelry to deteriorate and corrode over time. Product measurements: Chain length 15.7 in, Extension chain length 2 in, Weight 0.1 oz (2.91 g)