Christie's New York Displays the Largest Flawless Fancy Vivid Blue Diamond Ever to Appear at Auction.

It's been described as 'blue perfection' by jewelry experts. And it's just as expensive as it is beautiful. Pegged at $21 to $25 million (USD) it leads the upcoming Christie's Magnificent Jewels sale in Geneva. Rahul Kadakia, the Head of Jewelry for Christie's Americas & Switzerland, says what makes this stone special, is that blue diamonds are very rare, accounting for less than two percent of world diamond production.

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