The data illustrates the operating margins made by the five leading diamond mining companies worldwide from 2010 to first half of 2017. In 2016, Russian diamond mining company Alrosa had the highest operating margin among the leading diamond producers worldwide, at 48%.
Alrosa | 24 | 34 | 33 | 34 | 36 | 44 | 48 | 38 |
Petra Diamonds | 27 | -5 | 7 | 26 | 24 | 14 | 18 | 21 |
De Beers | 8 | 11 | 13 | 16 | 19 | 12 | 17 | 18 |
Rio Tinto | 13 | 5 | -9 | 10 | 16 | 19 | 12 | 11 |
Dominion Diamond | 45 | 40 | -12 | 7 | 22 | 4 | -5 | 11 |