Auction introduction: Sotheby’s is delighted to unveil a stunning selection of gemstones and designer jewelry on 31 March. From 20th-century classics to contemporary masterpieces, these treasures showcase the skill and artistry of the world’s greatest houses, including Cartier, Van Cleef & Arpels, Chaumet, Harry Winston, Graff, and Marchak. Among the highlights of this sale are an exceptional natural pearl necklace featuring a largest pearl measuring 16.15 mm in diameter, an unheated Kashmir sapphire weighing 4.32 carats, and a Van Cleef & Arpels ring set with a 7.39-carat cushion-cut diamond of D colour. The sale will also feature a fine selection of jewelry from the Art Deco movement, including a fully articulated diamond bracelet by Cartier and a large brooch depicting a landscape animated by Chinese figures, which was exhibited at the 1925 International Exhibition of Modern Decorative and Industrial Arts.