rough diamonds

A diamond the size of a tennis ball that is 3 billion years old will be sold for at least $ 70 million, according to Sotheby's prestigious auctioneer.

On September 9, a white diamond of 232 carats worth $ 20 million has just been found in a diamond mine in South Africa.

The world's most expensive Mir diamond mine in eastern Siberia can create a vortex strong enough to suck helicopters flying across the depths.