This classic 18K white gold filled herringbone chain necklace comes with a lobster clasp. It is 19.7 inches long and 4mm wide. This necklace is hypoallergenic and waterproof, so you can do your daily routine without having to take it off. We have 16 inch ~ 38 inch; 18K White Gold/Yellow Gold Filled in stock for this model.*** Free Velvet Gift Pouch Included. .