A natural pearl and diamond brooch. Estimate US$ 15,000 - 20,000 (€14,000 - 18,000). Photo Bonhams.

designed as a pierced and openwork pavé-set diamond plaque of oval outline, centering a greenish gray natural pearl, measuring approximately 8.82 x 8.70mm, flanked by old European-cut diamonds; larger diamonds weigh approximately 0.75 carat each; estimated total diamond weight: 4.35 carats; mounted in platinum; length: 2 1/8in.

Accompanied by GIA report #2165801551, dated November 17, 2014, stating: the pearl of natural origin, saltwater, no indications of treatment.

Bonhams. FINE JEWELLERY, 15 Apr 2015 14:00 EDT - NEW YORK