RENE BOIVIN. AN EMERALD AND DIAMOND CLIP BROOCH. The shield-shaped plaque composed of foliate sections set with brilliant-cut diamonds, interspersed with square-cut emeralds, to a central sugar-loaf emerald within an odeonesque concentric pattern of polished gold. French assay mark and maker’s mark. Accompanied by a certificate from Francoise Cailles stating the date of manufacture to be 1935.