Sotheby’s will auction a 28.88 carat diamond from De Beers’ Jwaneng mine in Botswana, giving it an upper price of $2.8 million. The stone, named the Jwaneng 28.88, is a round, D-color, internally flawless diamond. It will feature at a jewelry sale on April 23 during the auction house’s Hong Kong luxury week, Sotheby’s said last week. De Beers’ master cutters took the stone from a 114.83-carat rough diamond to its polished form following months o…
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