Black Opal Fish ring1 fish, 2 fish, black fish, blue fish. Lighting Ridge, NSW Black Opal Fish ring set on a sterling silver claw band. Two variants of black opals were used to create this divine creature. The sterling silver prongs were made specially to suit this little fishy. This opal carries within it small traces of sand, elements from its creation that couldn't be fully removed. But rather than detract from its beauty, these inclusions lend the gemstone an extra