It really depends on your eye. Some people on here say they can see the difference between D and F. Others say D and E. Others say D and H. But the D/E/F designations are colorless range. G is right after F. In my book that makes it still pretty darn colorless. Also I have a G stone and it looks really white. Then again my stone reflects alot of white light back as a BIC.
You mention F ID or G VG. What is the price difference? If they were the same, I'd choose F Ideal..why not? What is your priority...color over cut? Cut over color? I'd choose cut over color...ideal all the way. So that again means F. But if the G VG is better for your budget, chances are you are fine there too. Preference
It doesn't matter! They will look the same. You get the diamond out of that sterile
world of great lights and machines that can tell what diamond performs and what
does not and into the average light, limiting conditions and grease and dust. The
limited viewing is not under a microscope but at a distance.
Don't beat yourself up on the it, but a good question.