Pieces: 1-piece Material: Glass stone, Freshwater pearl, 18K gold-plated, Titanium steel, Synthetic crystal 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. Imported Product measurements:One Size:Chain length 16.5 in, Weight 0.6 oz (16 g)