What csets of the main palatte are used for Link's sprites when he has the blue ring, red ring, or gold ring?
Ring csets
I'm not 100% sure, but the main pallete changes when you get a ring. So CSet6 has green when link has no ring, blue with the blue, etc. In either case, in Links pallete, Cset6 is no ring, 8, 9, and 10 are blue, red, and gold repectively.
Ah, but they're not on the main palette. What happens when link gets a ring is that Cset 6 on the main palette is replaced with Extra Sprite Palette Csets - 6 for the Blue Ring, 7 for the Red Ring and 8 for the Gold ring. Be careful though, because this palette change is for everything that uses the Cset (combos, item sprites, monster sprites, misc. colours etc), so you might end up with some funny looking monsters or something
Extra Sprite Palettes 9-12 are likely to look similar to these also - they're used for the game icons.