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'Sky Blue' diamond, Russian imperial court jewels auctioned

Associated Press Associated Press 16/11/2016

A model shows 'The Sky Blue Diamond' ring at the auction house Sotheby's in London, Tuesday, Oct. 11, 2016. The mesmerizing and rare vivid blue diamond weighs 8.01 carats, mounted by Cartier, will be on auction on Nov. 16, 2017 with an estimate of 15-25 million dollars © 12-20 million pounds, 13.5-22.5 million euro A model shows 'The Sky Blue Diamond' ring at the auction house Sotheby's in London, Tuesday, Oct. 11, 2016. The mesmerizing and rare vivid blue diamond weighs 8.01 carats, mounted by Cartier, will be on auction on Nov. 16, 2017 with an estimate of 15-25 million dollars GENEVA — Sotheby's is auctioning the square-cut "Sky Blue" diamond set in a ring by Cartier that is expected to fetch up to $25 million, plus two centuries-old diamond jewels dating back to Russia's imperial court.

The auction house says the 8.01-carat stone with a top-rank Fancy Vivid Blue grade from the Gemology Institute of America is the centerpiece of its latest Geneva jewelry auction on Wednesday.

Also on the block is a diamond necklace said to have been commissioned by 18th-century monarch Catherine the Great and a diamond jewelry set believed to have been in a gift from Peter the Great's wife to Ottoman Sultan Ahmed III as part of peace negotiations. Each piece was expected to fetch $3-5 million.

On Tuesday, Christie's reaped $97 million in a Geneva jewelry auction.

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