How Are Lab-Grown Diamonds Certified And Graded?

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Some lab-grown diamonds undergo grading and certification similar to natural diamonds by adhering to the the 4Cs of cut, clarity, colour and carat. After being sent to a gem lab that specializes in grading diamonds, lab-grown diamonds are graded independently by several of the lab's gemmologists. Afterward, the individual grades are compiled and compared to give the lab-grown diamond its final grade.