The 163-carat stone is the centerpiece of an emerald and diamond studded necklace.
A diamond necklace featuring a flawless 163-carat diamond - the largest of its kind to be auctioned - has fetched $33.5m (£25.5m) at a Christie's event in Geneva.
On Monday a diamond known as the Pink Star sold for a record $83m (£52m) at auction in Geneva.
The necklace, named The Art of de Grisogono, sold for $33.5m - $29.5m plus $4m premium - exceeding pre-sale predictions of $30m. The stone was the largest of its kind ever auctioned.
A team of 10 specialists in NY cut the jewel from a rough 404-carat stone discovered in Angola past year, the biggest diamond ever found in that country.
The finished piece is made from white gold, diamond and emeralds.
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Unsurprisingly it comes with a hefty price tag.
It has since passed through the hands of famous French jeweler Frederic Boucheron and later the Baron von Derwies.
The buyer's identity has not been revealed.
Tuesday's sale marked the first time the diamond appeared at auction in 130 years.
Christie's jewel auction, which raked in sales totaling 105.4 million Swiss francs, will be followed Wednesday by a similar auction at Sotheby's.
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