just to add on a bit, most of the current kit lenses are G lenses...
as from what i had read from various websites... Nikon used to put gold ring on IF-ED lenses only... but nowadays seems like the Gold Ring definition is a little bit blurred... e.g. 14-24mm and 24-70mm are not having real IF design but still having the gold rings...
G lenses are cheaper to make mah.