Model wears 110-carat yellow diamond ring
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110-carat yellow diamond to be auctioned for £7m

15 November 2011 Last updated at 06:34 GMT

Auction houses in Geneva are defying Europe's economic problems by holding their annual jewellery sales and one of the world's rarest and biggest diamonds is on offer.

The 110-carat yellow sundrop is expected to be sold for at least £7m.

Imogen Foulkes reports.