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.