Cartier Paris, Art Deco Brooch convertible in Necklace (chain and platinum element including) in platinum 850, 18k gold 750, rose cut diamond, calibrated sapphire and centered by a cabochon Moonstone, circa 1915 Signed Cartier Paris, numbered, French marks. Gross weight: 8.69 grams. Size: 1.18 x 0.79 inches (3.3 x 2.3 cm.)