Color grades GIA vs. AGS?

[Dr. Mitch Buchannon]

I understand that EGL color grades might not be as strict as GIA, but for a round stone with no florescence.. will AGS and GIA grade the color the exact same... or is one certification tend to be more/less strict?

 

[Richard Sherwood]

These two labs are veryyy similar in their grading.

But I have to say, in my experience regarding the minority of cases where they differ, the AGS seems to be a very, very slightly more lenient in their color grading than the GIA.

In other words, if they disagree on 1 out of 100 stones, I would expect the GIA to be tougher in that case than the AGS.