Billionaire buys world's most expensive diamond

On Wednesday, the 'Blue Moon' diamond sold for a whopping € 45.121.124 ($48.4) million, making it the world's most expensive diamond.

According to the auctioneer David Bennett, it is the "highest price per carat" ever obtained for any kind of stone.

On Wednesday 11th November 2015, the 'Blue Moon' diamond sold for a whopping € 45.121.125 ($48.4 million), making it the world's most expensive diamond.

According to the auctioneer David Bennett, it is the "highest price per carat" ever obtained for any kind of stone.

The record sale, which took place at a Sotheby's auction in Geneva, was a headline in itself. But when the successful bidder renamed it, 'Blue Moon of Josephine', tongues were set wagging.

Just a day before, at a Christie's auction, also in Geneva, an anonymous bidder purchased a 16.08-carat pink diamond, for € 26.570.750 ($28.5) million. He dubbed it, 'Sweet Josephine.'

Lau has a track record for naming gems after his daughters, 7-year-old Josephine and 13-year-old Zoe.

Back in 2009, Lau purchased a 7.03-carat blue diamond for € 8.435.500 ($9.48) million. He named it, the 'Star of Josephine.'

Last November, he purchased a Burmese ruby and diamond brooch weighing 10.10 carats for  

€ 7.498.740 ($8.43) million, naming it 'The Zoe Red', as well as a 9.75-carat blue diamond for

€ 30.394.000 ($32.6) million, calling it 'The Zoe Diamond.'

Lau is a prolific collector of art and wine, and has a penchant for extravagant gestures. He is the owner of a € 16.222.570 ($17.4) million Andy Warhol portrait of Mao Zedong. He also built Hong Kong's tallest retail complex and named it 'TheONE', reportedly after an ex-girlfriend. 

The record sale, which took place at a Sotheby's auction in Geneva, was a headline in itself. But when the successful bidder renamed it, 'Blue Moon of Josephine', tongues were set wagging.

Just a day before, at a Christie's auction, also in Geneva, an anonymous bidder purchased a 16.08-carat pink diamond, for $28.5 million. He dubbed it, 'Sweet Josephine.'

Lau has a track record for naming gems after his daughters, 7-year-old Josephine and 13-year-old Zoe.

According to Forbes, Lau is the 114th richest person in the world with an estimated net worth of

€ 9.2 ($9.8) billion.