Manufacturers
Petra Diamonds reports 16% increase in revenue
![](https://www.jewelleryfocus.co.uk/wp-content/uploads/2015/01/koffiefontein-mine-in-south-africa-e1422442848262-780x470.jpg)
Independent mining firm Petra Diamonds revenues have climbed 16%, despite a 2% fall in production, in its six-month results up to December 31, 2014.ย
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