Solid Sterling Silver Rhodium Plated 1.8mm Round Box Chain Necklace, 18" 20" 22" 24" 26" 30" This necklace is made of solid sterling silver and stamped "925." This classic necklace looks great alone or with your favorite pendant. Necklace is 1.8mm thick and comes in: -18 inch long ( weight: 7.1 gram); -20 inch long (weight: 7.9 gram); -22 inch long (weight: 8.7 gram); -24 inch long (weight: 9.5 gram); -26 inch long (weight: 10.3 gram); - 30 inch long (weight: 11.9 gram). For best results, we do strongly recommend using a tape measure to check neck size before placing your order. Rhodium plated to prevent tarnishing