Ross-Simons - 3.30ct t. w. London Blue, Sky Blue, White Topaz Drop Earrings, Blue Enamel Over Sterling. An RS exclusive. The roaring '20s are back again! We're paying homage to trends past with these glamorous 18kt yellow gold over sterling silver drop earrings that recall a vintage-inspired look with 3.30 ct. tot. gem wt. sky blue, London blue and white topaz gems in a geometric design. With flecks of blue enamel, this pair is ready and raring to hit the town. Hanging length is 1 5/8". Leverback, white and blue topaz drop earrings. Blue Topaz birthstones are the perfect gift for December birthdays.