These beautiful Swarovski Rivoli Round Crystals feature precisely cut and polished facets, with a bright foil backing. They are undrilled, and designed to fit a wide variety of our Rivoli Settings. Use with any of our high quality adhesives such as our GL600. The Yellow Opal color has a bright happy yellow shade with an opalescent finish resembles the natural gemstone Citrin. It is both fiery and elegantly matte, combining the power of color with genuine, gemstone appeal.