Beautiful pyrite, like a starry sky, is set in this beautiful, deep blue gemstone. Also, as it is a natural stone, white calcite is also present, giving it a mysterious impression. This natural gemstone is undyed and completely untreated. It has a good luster and shine, and is a wonderful, flawless piece. The carat weight is 13.8, and the size is approximately 2cm in length. The material is K18, with a hallmark on the bail. Purchased from a specialty store and kept in storage. Chain is not included.