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The worlds largest 13.22ct pear shape blue diamond

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The world’s largest flawless fancy vivid pear shape blue diamond is due to go on sale next month and is expected to fetch up to £15 million.

The blue diamond, which has been named “blue perfection” is the biggest diamond of its kind ever to appear at auction and will headline the upcoming sale in Geneva.

Rahul Kadakia, Head of Jewellery for Christie’s Americas & Switzerland, said: "To have a stone that weighs 13 carats is near impossible.

"The stone is internally and externally bereft of any imperfections... in simple terms; it's the best blue diamond in the world."

Natural fancy coloured diamonds are very rare and expensive; they are so rare that blue diamonds  make up less than 2% of the world’s diamond production.