Aquamarine Freshwater Pearl 18K Yellow Gold Necklace For Sale at 18" Freshwater Pearl Necklace in Gold 5 6mm 18" Freshwater Pearl Necklace in Gold 5 6mm 18" Freshwater Pearl Necklace in Gold 5 6mm Jewelry New 18k Gold Plated Fresh Water Pearl Necklace Poshmark Sterling Silver Freshwater Pearl Double Layer Pendant Necklace By. Pieces: 2 piece Material: Freshwater Pearl,18K Gold Plated,Natural stone,Brass,Abalone shells 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: Pearl Necklace: Chain length: 14 in, Extension chain length: 3. 46in Pendant Necklace: Chain length: 16 in, Extension chain length: 2. 13 in