I think Gary is right, although the diploma is called "Graduate Diamonds." It''s not commonly listed separately, and I''ve not seen a two-letter acronym for it before, but it is a stand-alone diploma program.Date: 12/12/2007 12:56:46 PM
Author: DiamondExpert
Could mean Diamond Graduate, someone who has completed the diamonds and diamond grading portion of the GIA G.G.