Unisex Solid 10k Yellow Gold Comfort Cuban Curb 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 solid 10k gold (not plated or filled) and stamped "10K". This classic necklace looks great alone or with your favorite pendant. Necklace is 3.6mm thick and comes in : -18in (weight 6g), -20in (weight 6.6g), - 22in(weight 7.3g), -24in (weight 7.9g).