Antique Opal & White Topaz Bead Necklace

With opal beads graduating in size from 6 to 15.2 mm., alternating with white topaz rondelle beads, with a platinum clasp centering a Swiss cut diamond weighing approx. 0.03ctw. framed by Rose cut diamonds measuring approx. 1mm., fashioned in platinum. Length 29 inches.