Dan. The big ring's like class rings or just big 14k rings and some wedding rings fall in high tone with my cz3d, in both mode's.I have read some post on the forum that some cz3d might be hotter than other's.Same with nickels new or old high tone in or out of the ground.I have checked 30 14k small rings they id in foil.The cz3d is a great detector. But i would still like a fisher that will notch. I just don't know the one to get that will be the best.Thank's for the info BILL-N.C.