This pendant by Amano Studio in California is cast in jeweler's brass. It will patina over time but can be polished back to bright gold. You can use vinegar or ketchup to polish brass with a soft cloth. The pendant hangs from a 18" 14/20 gold fill chain. Gold fill has a much thicker layer of gold than gold plated so it requires less maintenance. However, avoiding chlorine and too much water is recommended to keep the necklace in original condition.