Makes sense. I've also been reading that you need a grading report to verify your diamond's stats...four Cs, proportions, etc. I've heard of a few labs, but GIA seems to be the most reputable. Would you say that's true?
I guess I don't see why this is so important. I mean, isn't the question at the end of the day: do you like the way it looks?
With diamonds I never worry about the resale value, because anything that you buy, walk out the store, and see an instant 30-50% drop in value, isn't an investment or something you should consider reselling in the future.