An attractive Art Deco gem-set brooch, circa 1925, designed as a geometric plaque, pierced with a

An attractive Art Deco gem-set brooch, circa 1925, designed as a geometric plaque, pierced with a design of three singing birds under a canopy of blossoms beneath the sun, set with single-cut and rose-cut diamonds, a calibré-cut citrine, a pair of step-cut sapphires, circular-cut rubies and accents of black enamel, mounted in platinum, length 3cm, Portuguese assay mark for platinum