The largest diamond discovered in over 100 years is set to fetch more than £50 million when it goes under the hammer next month.

Known as the Lesedi la Rona - or "our light" - the three billion-year-old rock has 1,109 carats.

It is also the second-largest gem-quality rough diamond ever found when it was unearthed in Botswana in November.

And it could be yours - if you have the cash - when it goes on auction in London on June 29.