Necklace Length: 14", 16", 18", 20" Chain Width: 4mm About Gold Filled Jewelry: What is gold-filled? We carry gold filled jewelry that is composed of a solid layer of 18kt gold, that is bonded to a base metal. Gold Filled and vermeil jewelry are great quality alternatives to solid gold. With proper care and storage, you will have jewelry that will last a lifetime. Tips to make your jewelry last: 1. Keep it dry. Store your jewelry in the plastic bag included in your purchase. 2. Avoid harsh chemicals such as perfume, hairspray, lotions and oils. 3. Never use abrasive products to clean your jewelry.