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Lot 180. A 13.03 carats Ceylon sapphire and diamond clip brooch, Oscar Heyman, 1955. Estimate US$ 30,000 - 50,000 (€25,000 - 41,000). Photo: Bonhams.

centering a rectangular-shaped emerald-cut sapphire, weighing 13.03 carats, set within a radiating spray of tapered baguette and round brilliant-cut diamonds;unsigned, no.96117; estimated total diamond weight: 5.50 carats; mounted in platinum; length: 1 1/2in.

Note: Accompanied by AGL report # 1082987, dated April 11, 2017, stating the sapphire as: Ceylon (Sri Lanka) origin, no indications of heat or clarity enhancement. 

Accompanied by a certificate of authenticity from Oscar Heyman, dated July 21, 2017.

Bonhams. FINE JEWELLERY, 19 Sep 2017, 13:00 EDT, NEW YORK