Flawless diamond sells for record $26.7m at auction

A flawless diamond has set a world auction record, selling for $26.7m (£17.5m).

The rare Botswana-mined 101-carat diamond was sold at a Christie's auction in Geneva.

It was bought by the Harry Winston firm and beat the previous record set by the 76-carat Archduke Joseph diamond, which sold for $21m (£13.8m) in November 2012.