Does GIA grade laboratory-grown diamonds?

Yes. GIA has been grading laboratory-grown diamonds since 2007. From 1 July 2019, GIA Laboratory-Grown Diamond Reports and identification reports no longer use the term “synthetic”. The GIA Laboratory-Grown Diamond Report includes the standard GIA colour, clarity and cut grading scales for reference purposes. The reports use descriptive terms to identify colour and clarity. The following statement is included on the report: This is a man-made diamond produced by CVD (Chemical Vapour Deposition) or HPHT (High Pressure High Temperature) growth processes and may include post-growth treatments to change the colour.