1.Petra Diamonds two.Lucara Diamond Corp three.Anglo American four.Tiffany & Co. five.Cartier 6.jayamargems seven.Pandora eight.Cartier nine.Signet Jewelers ten..Signet Jewelers https://top-global-companies-by-182356.activoblog.com/1443980/major-10-foremost-diamond-firms-on-the-planet