1960s. Oval shaped opal ( 0.51 x 0.67 in, 1,3 x 1,7 cm ) and drop opal ( 0.55 x 0.67 in, 1,4 x 1,7 cm ) weighing 15,40 carats and 68 diamonds in brilliant-cut weighing 1,80 carats. Set in 18K white gold. Hallmarked on the clasp with 750. Total weight 18,64 grams. Very good condition. Length: 9.84 in ( 25 cm )