The pear-shaped, 6.16-carat, fancy dark grey-blue stone has passed through the hands of the royals from four European dynasties, over the last 300 years

Historic ‘The Farnese Blue’ diamond to be auctioned at Sotheby’s sale after 300 years

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the farnese-blue-diamond

Historic ‘The Farnese Blue’ diamond to be auctioned at Sotheby’s sale after 300 years