By Hannah Connorton
The current owner of this 100-carat emerald-cut diamond spent an entire year studying, cutting and polishing the rough to create the “perfect” stone. Sotheby’s will attempt to sell the stone later this month.New York--The largest “perfect” emerald-cut diamond ever offered at auction is expected to sell for as much as $25 million later this month at Sotheby’s New York auction.

The 100-carat emerald-cut stone is of D color and internally flawless. Sotheby’s notes that, “at this impressive scale, diamonds of this exceptional quality … are incredibly rare, and considered ‘perfect.’”

The stone was cut from a 200-carat piece of rough mined by De Beers in southern Africa.

Overall, Sotheby’s April 21 sale of Magnificent Jewels in New York is estimated to achieve in excess of $50 million. The 350-lot sale includes colored diamonds, Art Deco jewels, Kashmir sapphires and pieces with provenance.

In addition to the “perfect diamond, the lots include a 6.24-carat pear-shaped fancy purplish-pink diamond set in platinum and flanked by two cushion-cut Kashmir sapphires. Another colored diamond, this one a 6.06-carat fancy blue set in platinum and rose gold with pink-hued diamonds, also will be offered at the sale. Both rings are expected to fetch more than $3.5 million.

Among the jewels of provenance is a platinum, emerald and diamond pendant from the estate of Mary Lily Kenan Flagler, wife of American industrialist and pioneering developer Henry Flagler. The piece has a pre-sale high estimate of $1.5 million.

Additional information on the sale is available at

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