Lab-created diamonds are real diamonds, chemically, and they will test as a true diamond when using a mechanized testing tool. They are made of the same carbon as natural diamonds but are grown in lab conditions. However, some may test as Moissanite or non-diamond because there can be impurities in the lab-created diamond. Using a testing tool as a beginning tool is fine, but if you are valuing your diamond, make sure to have several tests done to verify the quality of your diamond.