Mine is a G. I didn't intentionally look for a G but the jeweler showed it to my husband first and they were both (hubby and jeweler) so excited to find a 1.30 ct Internally Flawless triple ex GIA stone. I usually prefer diamonds in D or E, or K through M, or in fancy colors. I absolutely love my diamond and think it is the most beautiful thing I've ever seen but I am biased just like most people are about their diamonds.
When I wore an e-ring...F (2 tcw) and G (3 tcw). Couldn't tell a bit of difference but the 3 ct was a better cut.
Not a ring but my studs are G and they look very white but the cut is ideal.
The right cut can hide a multitude of sins!