If you are a gem lover, it is alright to be envious as the world's largest blue diamond to come for auction has been sold. What may also interest you is that the 15.

'The De Beers Cullinan Blue': World's largest blue diamond goes under hammer, sells for $57.5 million

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'The De Beers Cullinan Blue': World's largest blue diamond goes under hammer, sells for $57.5 million