An egg-shaped diamond, found in a lump of rock by a poverty-stricken African girl, has gone on sale – as the  centrepiece of the world’s most expensive necklace.

Known as L’Incomparable, the flawless yellow gem has more than 407 carats. The necklace was created by luxury jeweller Mouawad and it was offered for sale at a Singapore jewellery show.

The necklace is studded with 90 white diamonds weighing nearly 230 carats and it can be yours for £34million.

The necklace has been awarded the title of ‘Most Valuable Necklace’ in the world by the Guinness World Records.

Source material: http://www.dailymail.co.uk/news/article-2443710/Worlds-expensive-necklace-sale-37million.html