We hold these truths to be self-evident, that all man-made diamonds are created differently, that they are endowed by their creators with certain inalienable features, that among these are Color, Clarity, Cut and Carat Weight.
Just like mined diamonds, lab-grown diamonds differ in terms of their 4C’s (color, clarity, cut and carat weight) and therefore require grading. Most of the mainstream gemological labs provide grading and certification services of lab-grown diamonds to the trade (however, there are certain issues with some of them).
For example, GIA does not state particular color and clarity, only groups. This may lead to confusion, since pricing can differ significantly. 1ct D VS1 Round stone might cost around $3500. But 1ct F VS2 Round stone is gonna be around $2500. However GIA report will consider them both as Colorless Very Slightly Included stones.
IGI is grading lab-grown stones properly, but at the same time GCAL also states Hearts & Arrows specification.
HRD reports are mostly common only in Europe, they are using their own grading scale.