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Lot 57. An aquamarine and diamond "Feuille de Platane" brooch, René Boivin, circa 1950. Estimate US$ 20,000 - 25,000 (€19,000 - 24,000). Photo: Bonhams.

centering a heart-shaped aquamarine, weighing approximately 21.90 carats, enhanced by textured gold leaves, adorned with old European-cut diamonds; signed René Boivin; estimated total diamond weight: 2.40 carats; mounted in 18k gold; length: 2 1/8in.

Accompanied by a letter of authentication from Francoise Cailles, dated April 28, 2015, stating the brooch is by Rene Boivin Joaillier, Paris 1950.

Bonhams. FINE JEWELLERY, 24 Apr 2017, 15:00 EDT, NEW YORK