Lab Created Diamonds look exactly like natural, mined Diamonds. There is no visual or chemical difference at all. That is because they ARE real diamonds (the Federal Trade Commission even recognizes Lab Diamonds as real)! The only thing that separates them is that Lab Grown Diamonds are made by man, and natural diamonds are made by the Earth.
Other diamond “simulants” (like Moissanite and Cubic Zirconia) do not sparkle like Lab and mined diamonds do. Whereas Lab Diamonds are chemically diamond (pure carbon), Moissanite and Cubic Zirconia are different minerals, with different chemical makeups, looks, and hardnesses. In other words, when placed next to a Mined Diamond, a Lab Diamond will look identical, whereas Moissanite and Cubic Zirconia will look different.