An uncut diamond is selected from a collection of colorless and colored diamonds on a sorting table at DTC Botswana, a unit of De Beers, in Gaborone, Botswana.

Want to buy a lab-grown diamond? The world's biggest diamond mining company is betting lower prices will lure U.S. shoppers to man-made stones.

De Beers Group is launching a new company and U.S. production facility with a line of lab-grown diamonds that will sell for far less than nature-made gems, the international gem giant announced Tuesday.