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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