14k Solid Yellow, White or Rose Gold 0.55mm Box Chain Necklace, 13" 15" 16" 18" 20" 22" This necklace is made of solid 14k gold (not plated or filled) and stamped "14k". This classic necklace is a great choice for wearing with your favorite pendant. Chain is 0.55mm thick, comes in: 13, 15, 16, 18, 20, 22 inches long.