Men's 10k Yellow Gold Lightweight Figaro Chain Necklace For best results, we do strongly recommend using a tape measure to check neck size before placing your order. This necklace is made of 10k gold (not plated or filled) with a hollow structure and stamped "10K". The hollow structure allows the necklace to be lightweight and comfortable to wear, as well as be larger for a more compelling price. This classic necklace looks great alone or with your favorite pendant. Chain is 3.5mm thick, comes in: -18in (weight 2.9g), - 20in(weight 3.2g),- 24in(weight 3.9g).