The world's most expensive egg has been unveiled in time for Easter - but you'll need to be a persuasive billionaire if you want to buy this expensive one-off. Looking like a cross between a Faberge egg and the Damien Hirst skull, 'Mirage' is a unique gem only the richest can afford. The incredible ornament has more than 1,000 diamonds on the outside, 100 of which are a unique cut. And the diamond-covered egg opens up to reveal a globe which was handcrafted in 18 karat gold.