THE VARIATIONS IN THE OPAL'S COLOR IS EVIDENT IN THIS BEAUTIFUL 18KT WHITE GOLD NECKLACE. THE BLUE-GREEN COLOR IS SO ENTICING AND EVERCHANGING. THE OPAL IS SET IN AN 18KT WHITE GOLD BEZEL APPROXIMATELY 1/2 INCH WIDE AND HIGH AND ATTACHED TO A 15 INCH WHITE GOLD CHAIN. THIS IS SUCH A LOVELY PIECE FOR ANY OCCASION.