This is a beautiful ring featuring fire opals and four small rose cut diamonds. The ring is a size 8, though it could be sized by a jeweler used to working with antique jewelry. It is crafted of 18 ct gold, and it's hallmarks, fully visible, declare that this ring is 18 ct gold, minted in Birmingham, in 1904 by H N W and co. The ring measures 3/8 of an inch North to South, and 3/4 of an inch (curved) East to West. The ring weighs 5.08 grams. The ring is in excellent condition, the opals are blue, and it looks beautiful on the finger. The center opal does have a few surface scratches, but I can only see them with a loupe. This one is a beauty! Note: All of the opals in the ring are blue, though the photo, using a macro lens, does not really show that.