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.
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{{Information |Description={{en|Mackay Emerald and Diamond Necklance 168 carats Muzo, Colombia 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 w
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