Certification

 

 

 

 

 

Both lab-grown diamonds and natural diamonds are certified by the two major diamond certificate companies: GIA and IGI. Lab-grown diamond grading reports are issued according to the evaluation of the 4Cs' diamond standards: carat, colour, clarity, cut and etc. 

The grading report clearly indicates that the diamond is lab-grown and also reveals the diamond production method, either by using high-pressure high-temperature (HPHT) or chemical vapor deposition (CVD).

Additionally, the certificate states whether post-growth treatment was detected for enhancing the diamond colour or the treatment could not be determined. Both GIA and IGI will laser-scribed "LABORATORY-GROWN" or "LG" and its certificate number on the girdle of the lab-grown diamonds to ensure that consumers are clearly notified with what they are buying.