This huge emerald is set in an art deco diamond and platinum pendant designed by Cartier. In 1931, Clarence Mackay gave the necklace as a wedding gift to his wife, Anna Case– a prima donna at the New York Metropolitan Opera from 1909 to 1920. The Mackay emerald, with a weight of 167.97 carats, was mined in Muzo, Columbia, and is the National Gem Collection's largest cut emerald. The emerald is set in a pendant-style platinum necklace, accented by an additional 35 emeralds and 2,191 diamonds. Mrs. Anna Case Mackay donated the necklace to the Smithsonian Institution National Museum of Natural History in 1984.


  • Title: Mackay Emerald and Diamond Necklace
  • Location: Muzo, Colombia, South America
  • Type: Jewelry
  • Rights: This image was obtained from the Smithsonian Institution. The image or its contents may be protected by international copyright laws. http://www.si.edu/termsofuse
  • External Link: View this object record in the Smithsonian Institution Collections Search Center
  • Weight: 167.97ct
  • USNM Catalog Number(s): G9775
  • Photo Credit: Chip Clark, Smithsonian Institution National Museum of Natural History
  • Field: Mineral Sciences
  • Fassion: Modified Oval Brilliant
  • Color: Medium Blue Green

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