Wednesday, Nov. 16, 2016 | 9:53 a.m.
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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