Unlike mined diamonds, laboratory grown diamonds are man made using advanced technologies that replicate the way diamonds were made in nature. They are gemologically identical to mined diamonds, to such an extent that the human eye cannot discern between a lab or mined diamond even under a microscope. For this reason all of our lab diamonds over 0.30ct are independently graded and certificated. The certificate confirms the diamond as laboratory grown and lists the 4 Cs of the diamond.