The necklace, known as the Art of de Grisogono, Creation 1, has a rectangular diamond weighing 163.41 carats as its centrepiece. The stone, found in Angola in 2016, is framed on one side by rows of diamonds and on the other by pear-shaped emeralds.The buyer, bidding by telephone at Tuesday night’s sale, will remain anonymous, Christie’s said in a statement. The pre-sale estimate was $25 mil…
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