It seems the russians just revealed they found the mother of diamond deposits back in the 70s, but kept it a secret until now:
http://news.yahoo.com/russia-reveals-shiny-state-secret-awash-diamonds-131212873.html
"The resources of super-hard diamonds contained in rocks of the Popigai crypto-explosion structure, are by a factor of ten bigger than the world's all known reserves, Mr. Pokhilenko said. We are speaking about trillions of carats."
http://news.yahoo.com/russia-reveals-shiny-state-secret-awash-diamonds-131212873.html
"The resources of super-hard diamonds contained in rocks of the Popigai crypto-explosion structure, are by a factor of ten bigger than the world's all known reserves, Mr. Pokhilenko said. We are speaking about trillions of carats."