René Boivin.
Jewel: Brooch in platinum and white gold adorned with a +/- 20-carat briolette-cut yellow sapphire and brilliant-cut diamonds.
(briolette-cut sapphire can be worn as a pendant).
Signed: René Boivin
In its original presentation case from Maison Boivin, Paris.
Size: +/- 5.5 x 5.8 cm.
See illustration.