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ARCHDUKE JOSEPH DIAMOND[/caption] The top lot of the sale was the historical 76.02 carats cushion-shaped âArchduke Joseph Diamondâ which sold for US$21,474,525 / SFr.20,355,000 (US$282,545 per carat), setting a new world record at auction for a colourless diamond. Over the seven hour long sale a total of 19 lots sold above $1 million with 147 buyers coming from 28 countries, competing enthusiastically in the room, on the telephone and online. Alfredo J. Molina, the diamondâ…
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