PIERRE STERLÉ - 1960S LARGE TURQUOISE "BIRD" BROOCH This brooch is set with cabochon-cut turquoise stones and finely engraved 18K yellow gold feathers. The beak is set with a line of small brilliant-cut diamonds. Mounted in 18K yellow gold and platinum. French work and hallmark of the Pierre Sterlé workshop. Gross weight: 52.59 g. Size: 10.5 x 9.7 cm approx. Reference: Viviane Jutheau "Pierre Sterlé", Editions Vecteur, Paris 1991. A turquoise, diamond and 18K yellow gold bird brooch by Pierre Sterlé, circa 1960. French assay mark and Pierre Sterlé maker's mark. Gross weight : 52,59 gr. Dimensions : 10,5 x 9,7 cm approx. Reference : Viviane Jutheau "Pierre Sterlé", Editions Vecteur, Paris 1991.