One of the cooler UV marbles you'll find out there, lights up SO brightly under the black light!! However, I don't know what blings more, the UV glass or that crazy amazing polished opal in there, WOW!!! Huge opal, with some of the best colors I've EVER seen in an opal, the full rainbow effect. Great fuming in there, such a fascinating design. It's topped off with a really nice backside with some cool large millie dots.