UFO spaceship Rainbow Opal ring in solid goldThis UFO Spaceship opal ring is on FIRE . Did you know that the colour red in opals is the most RAREST of all?! Especially when it comes to natural Australian opals (which is deemed the most valuable out of all the types of opals in the world). Lots of mexical fire opals are red, but they are in translucent crystal form. When the flashes of RED is also backed with dark stone, BAM, enough said. A hand cut, Natural & Solid, Australian opal from