14k White Gold 1.0mm Diamond-Cut Bead Chain Necklace, 16" 18" 20" Unsure what length chain to buy? 18 inches is the standard length and will look great on most people. 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 1.0mm thick, comes in: -16in (weight 1.3g), -18in (weight 1.4g), - 20in(weight 1.6g).