Russian uncut diamond major Alrosa will have to sell its stake in Angola’s Catoca diamond mining company owing to the latter’s concerns about the prospects for collaborating with the sanctioned company, Interfax reports. ‘The Angolans believe that the presence of Alrosa as a key shareholder is preventing them from developing their business,” Russian Deputy Finance Minister Alexei Moiseyev is quoted as telling reporters on April 26. “In general, they have fair reasons for this. We are already seeing that many Western companies, both suppliers and buyers of stones, are beginning to say, ‘You hav…