whether it be a CZ5, CZ3d, CZ70, Cortes, Coinstrike or GTi, jewelry will and can hit in numerous areas like nickel, penny, zinc, round pulltab (if you descriminate out round pulltab, you WILL NOT FIND a lot of gold jewelry.
I like the school of thought from Tony in North Carolina, who hunts mainly with a Coinstrike, who said he digs all positive signals. Yes a lot of diggin, but he finds a lot of stuff as well.
Look at it this way Grumpy, when you or someone else gets a new detector and goes to a site that they assume is hunted out and low & behold BAM, they found a few coins, now all of a sudden this new miracle machine was sent from heaven. When in actuality, its not the machine at all, it's just a new machine that they are trying to get a feel for and so they dig all positive signals without lot of descrimination.
Thats why you see so many traded or sold right after they use them for a short period of time. Once the initial WOW factor has worn off, it's quickly realized that it's just another detector afterall. Detectors manufactures base their marketing stratagies on this concept.
Also if you aint findin Jewelry, doesn't mean the machine isn't seeing it, just might not be there or its descriminated out.
Just my take on things anyways