Mackay emerald, 168 karats, 1931. - The stunning 167.97-carat Mackay Emerald was mined in Muzo, Colombia. The largest cut emerald in the National Gem Collection, it is set in an Art Deco diamond and platinum necklace designed by Cartier Inc. In 1931, Clarence H. Mackay presented the necklace as a wedding gift to his wife, Anna Case, a prima donna of the New York Metropolitan Opera from 1909 to 1920. The piece was donated to the Smithsonian Institute by Mrs. Anna Case Mackay in 1984
Emerald and diamond necklace - Designed by Ostertag; set with carved emeralds and diamonds in platinum; circa 1930. The longest dangle on the necklace and the earrings are each about 3 1/2 inches long. Photograph by Tino Hammid.
18 Karat Gold, Emerald and Diamond Necklace, Cartier, London The fringe necklace of Indian inspiration, set with 30 oval, cushion, emerald and step-cut emeralds weighing approximately 105.00 carats, accented by round, old European, old mine-cut and pear-shaped diamonds weighing approximately 46.50 carats, internal circumference 13 inches, signed Cartier, London; special order, 1947. With signed and fitted box.