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World’s Biggest Round Blue Diamond May Fetch $19 Million

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World’s Biggest Round Blue Diamond May Fetch $19 Million

By Scott Reyburn – Aug 27, 2013 7:00 PM ET


The world’s biggest round “fancy vivid” blue diamond is estimated to sell for more than $19 million at an auction in Hong Kong in October.

The brilliant-cut internally flawless stone, weighing 7.59 carats, will be auctioned by Sotheby’s (BID) on Oct. 7 as part of the company’s 40th anniversary sales in Asia, according to an e-mailed release from the New York-based auction house.



Big Blue

Enlarge image


“The Premier Blue,” a 7.59-carat colored diamond. The round, brilliant-cut, internally flawless blue stone is the largest of its type to appear at auction and will be sold by Sotheby’s in Hong Kong on Oct. 7. Source: Sotheby’s via Bloomberg


Colored stones, which account for about 0.01 percent of mined diamonds, dominate the top end of the jewelry market. Their scarcity and aesthetic appeal have triggered record auction prices in recent years, led by the 45.4 million Swiss francs ($45.6 million) paid by the London-based jeweler Graff for a 24.78-carat “Fancy Intense Pink” at Sotheby’s, Geneva, in November 2010.


“The market for colored stones is strong because of their rarity,” Guy Burton, a director at the London-based jeweler Hancocks, said in an interview. “People buy them for investment purposes, and they can be seen as a hedge against what happens in other markets.”


“The Premier Blue,” as it has been named, is the largest round fancy vivid stone of that color to have been graded by theGemological Institute of America, said Sotheby’s, who have not revealed the identity of the seller.

It was sourced from the Premier (formerly known as Cullinan) mine near PretoriaSouth Africa, the world’s main provider of blue diamonds, said Sotheby’s.


Record Prospect

“Round stones are the most popular,” said Burton, “and colored diamonds have an obvious appeal to buyers in Hong Kong and mainland China. If I were a betting man, I’d bet that this should make some kind of record. A lot depends on how aesthetically pleasing it is.”

The pigmentation of blue diamonds is caused by the presence of boron atoms. The higher the concentration of that element, the deeper the color.


“Fancy Vivid” is the third most intense gradation. A 5.30-carat cushion-cut blue diamond graded “fancy deep” — the highest intensity of color — sold for 6.2 million pounds ($9.6 million) at Bonhams in London on April 24.

The price of $1.8 million per carat was an auction record for a blue diamond, said Bonhams, which had 25 telephone bidders registered for the lot. The buyer at Bonhams was once again Graff. The jeweler paid 16.4 million pounds for the historic blue 35.56-carat “Wittelsbach Diamond” at Christie’s International in December 2008.

Sotheby’s 40th anniversary auction of jewels and jadeite in Hong Kong in October will comprise about 330 lots and is estimated to raise more than $HK600 million ($77.4 million).

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