Today in Hong Kong, one of the most impressive and rare blue diamonds in the world is set to go under the hammer at Sotheby's for an estimated $4.6-$5.9 million. The 5.18 carat vivid blue, internally flawless, pear shaped diamond is the first blue diamond from De Beers' exquisite Millennium Collection to come up for sale since going into a private collection following the year 2000 celebrations. Blue diamonds - like the famous Hope and Wittelsbach diamonds - get their colour from the presence of Boron during their creation and are extremely rare and precious. The Millennium Collection, which was brought together over a 20-year period from De Beers' mines, was meticulously polished by diamond polishing experts Steinmetz over a two-year period, supervised by Andrew Coxon, president of the De Beers Institute of Diamonds, to maximise their colour, beauty and brilliance.
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