About Synthetic Diamonds
A Synthetic Diamond is man-made, the result of a technological process, as opposed to the geological process that creates natural diamonds. Synthetic diamonds have essentially the same chemical composition, crystal structure, optical, and physical properties of diamonds found in nature.
Most synthetic diamonds are categorized as either high-pressure, high-temperature (HPHT) or chemical vapor deposition (CVD) diamonds, depending on the method of their production. Since HPHT and CVD diamonds are virtually identical to natural diamonds, differences only become clear when they are viewed by a trained grader in a gem laboratory.
How does a GIA Diamond Grading Report help you know if your diamond is natural or synthetic?
GIA tests every diamond to determine if it is natural. If a diamond is found to be laboratory-grown, GIA issues a Synthetic Diamond Grading Report, which looks distinctly different from the standard grading report. As an added precaution, GIA also laser-inscribes the diamond's girdle with a report number and a statement that the diamond has been laboratory-grown.