Men's Solid Sterling Silver Rhodium Plated Moon-Cut 3mm Bead Chain Necklace, 20" 22" 24" 26" 28" 30" 36" 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 rhodium plated sterling silver and stamped "925". This classic necklace looks great alone or with your favorite pendant. Necklace is 3mm thick and comes in: -20 inch long (weight: 12.5 gram); -22 inch long (weight: 13.8 gram); -24 inch long (weight: 15.1 gram); -26 inch long (weight: 16.3 gram); -28 inch long (weight: 17.6 gram); -30 inch long (weight: 18.8 gram); -36 inch long (weight: 22.6 gram).