A platin, 18k gold, opal and diamond collier

Composed of 15 cabochon-cut Harlequin opals weighing approx. 40 carats, alternated by brilliant-cut diamonds weighing approx. 15 carats, colour H/I and clarity VVS/VS, l. 44 cm. Provenance: Jewellery Cusi, Milan, peso 92,4 gr.