BOUCHERON RETRO SAPPHIRE AND DIAMOND CLIP-BROOCH
Calibré-cut invisibly-set sapphires, old and baguette-cut diamonds, platinum and 18k white gold (French marks), circa 1940, signed Boucheron Paris, numbered
Size/Dimensions: 4.6 x 4.6 cm (1 3/4 x 1 3/4 in)
Gross Weight: 31.6 grams
Literature
Cf. G. Néret, Boucheron: Four Generations of a World-Renowned Jeweler, New York, Rizzoli, 1988, p. 120