This is a black opal ring. Black opals of this size are extremely valuable and rare. When illuminated by sunlight, the deep blue and orange colors shine, making it a very beautiful ring. There is one flaw. Opals are very soft stones, so they often have streaks and "kan" (which are a natural characteristic). This opal also has a "kan" at the bottom of the stone, although it is not a crack, and it does not appear on the front of the stone. It's a streak that is barely noticeable to the naked eye. This is a great deal for those who understand this condition. The reference price is over 5 million yen. Size: 9.5 Weight: Approximately 16.3g Please allow for some margin of error. Marking: Pt900 Marking: 8.79 1.68 Please check the profile before commenting to purchase. m(__)m