Above all, the source of your lab report can have a profound impact on your results. Not-for-profit labs tend to grade more critically than for-profit labs. The video below shows you how the same diamond received two different cut and clarity grades one from the Gemological Institute of America or the GIA (not-for-profit) and one from the European Gemological Laboratory or EFL (for-profit). As a result, there is a profound difference between the results from the two labs.
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