G quality in diamonds refers to a diamond’s color grade, which is part of the Gemological Institute of America’s (GIA) color scale ranging from D (colorless) to Z (light yellow or brown). G color diamonds fall within the “near-colorless” category. They have a very slight tint that is typically undetectable to the naked eye, making them appear almost colorless. G quality diamonds are highly sought after for their excellent balance of near-colorless appearance and more affordable price compared to completely colorless diamonds.