Auctions
‘Extremely rare’ blue diamond Cartier ring could fetch £20.3m
![](https://www.jewelleryfocus.co.uk/wp-content/uploads/2016/10/The-Sky-Blue-Diamond-1-e1476177683434.jpg)
Sotheby’s has announced it will auction an “extremely rare” fancy-vivid blue diamond ring by Cartier, which could fetch up to $25m (£20.3m).
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