International
$21m blue diamond up for auction at Christie’s
![](https://www.jewelleryfocus.co.uk/wp-content/uploads/2014/04/blue-diamond-web-780x470.png)
Auction house Christie’s has announced the sale of the largest flawless vivid blue diamond in the world, โThe Blueโ estimated to fetch $21m (ยฃ12m) at auction.
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