Russia is about to start tapping into a huge source of diamonds that could supply the world market for the next 3,000 years.

Scientists estimate there are 'trillions of carats' lying beneath a 35million-year-old asteroid crater in Siberia - more than ten times the global stockpile.

The Kremlin has known about the reserves under the 62-mile-wide impact zone since the 1970s.

But it has kept it a secret until now because it was already reaping big profits in what back then was a heavily controlled market.