I use a Prizm IV, it's just like a Prizm II with added features.
I turn of all disc and dig everything in my path. If there is a repeatable signal under the coil, I dit it. It doesn't matter what the display tells me. Gold and silver rings can show anywhere on the display, with gold showing from zinc cent down to iron, and silver from zinc cent up to 50cent/dollar. The Prizm line of detectors are very capable of finding jewelry. You just got to know where to look. I've learned to find more jewelry, I go to sports fields or beaches where jewelry is more likely to get lost. You will dig a lot (and I mean a lot) of junk to find jewelry, other than coins. 75% to 85% of what I find is junk. There is just no way around it. Removing junk helps for next year's hunt in the same sports field.
Hope this helps
HH