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12 of the world's rarest diamonds available to buy

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Cartier-Sky-Blue-diamond
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Cartier Sky Blue diamond

Thanks to their rarity and beauty, blue diamonds are often among the most expensive stones to be offered at auction and Sotheby's latest instalment is no exception. The 8.01 carat Fancy Vivid blue 'Sky Blue Diamond' will be the centrepiece of the house's Magnificent Jewels and Noble Jewels sale in Geneva on November 16, 2016 and carries an estimate of $15-25 million. The square emerald cut diamond is currently set in a Cartier ring surrounded by brilliant cut and baguette white diamonds and is described by David Bennett, worldwide chairman of Sotheby's International Jewellery Division as being "of a wonderfully clear celestial blue".

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