Length: 18 inches. MATERIALS 18K Gold Filled If you love the look of gold, but don't want to spend as much as you would for solid gold pieces without losing out on quality, then gold filled is a great option for you. It is the second-best option after solid gold for high quality jewelry at a more affordable price. It is also far better than gold plated because a much thicker layer of gold is used, making it stronger and longer lasting.