At the Couture and JCK Las Vegas trade shows, the beguiling boulder opal made a gorgeous mark on a bevy of fine jewelry.

There’s something special about opals — several things, to be exact. Every opal is unique due to variations in flashes of color and patterns. And the shade of the opal can change based on the lighting ...

7.9 x 4.2 cm. (3.1 x 1.7 in.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...