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This blue diamond may become the most expensive gem ever sold at auction

Cecilia Jamasmie | September 18, 2015 | 8:46 am Africa Europe Diamond 

[caption id="attachment_834219" align="aligncenter" width="600"] The diamond's name makes reference to the idiom "once in a blue moon," as is very rare to find one of that shade and clarity.[/caption] A rare 12-carat, flawless blue-coloured diamond, known as Blue Moon, may...

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