The world's largest flawless diamond weighing over 300 carats is set to fetch at least £13million.
Named the Golden Canary due to its deep yellow colour, the pear-shaped jewel went on public display in Dubai yesterday and will be auctioned by Sotheby's in December.
It was found hidden in a pile of rubble in the Democratic Republic of Congo in the 1980s by a young girl playing in her uncle's garden.