This simply design 18K Rose Gold Filled herringbone chain necklace is 19.7 inches long and fastens with a lobster clasp. The chain is approximately 4 mm wide. This necklace is hypoallergenic and waterproof, so you can do your daily routine without having to take it off. We have 16/18/20/22/24 inches in stock for this model.*** Free Velvet Gift Pouch Included.