Hi, I am a Safari user and like Bart says, gold rings can register all over the place. Yes, different karat gold will register differently as will the colors of gold as in yellow, white or pink. This is due to the different alloys used in making the gold. Also different sized rings of the same karat will often give different readings. If you are after gold rings you will have to dig every time the pull tab icon shows up on your screen. No detector yet invented can differentiate between pull tabs and gold rings, the only 100% sure discriminator is your eye after digging up the signal!! Good luck, hope you dig a bunch of the yellow stuff!!