A lot of valuable rings and jewelry are silver and thats how I hunt so I'm going to use the word jewelry. 2tone, 28kfz notch 0-46, 69-78, 97-99. I use the Elip hp but other ok at 28. I know this may raise some eyebrows at first but this is my reasoning. My mom was a big ring and jewelry person and i have a lot of her rings and other jewelry. I also have bags of just about every kind of trash you can name to test them against. My goal was to ring up as much micro jewelry as possible as well as rings without the kind of digging that will quickly wear you out. The 1st notch will still retrieve the tiny gold such as solid crosses and baby rings. The only thing you may lose are the really thin gold chain and gold that is open. You can find these by erasing this notch or running on 70 but this will p/up tiny aluminum which is really hard to find. Yes notching the 69-78(nickle) will lose a few gold plated rings. When I tested I lost 5 out of 22 rings. BUT I also lost over half of the pull tabs. Thats a lot of extra digging but its your call. Also when jewelry hunting I do small areas at a time and then set the machine to a nickel program and go back over as time permits. If you notch above zice pennys you will lose some valuable silver jewelry and maybe a silver coin or two. I try to stay in areas where lots of folks have been, trees, open parts, pools, grandstands, but no picknic tables or next to the parking lot. Thats for coin hunting. Of course if you can do a fresh water beach or hunt in the water where mowers can't shave a can into millions of piece you can adjust the notch and find more otherwise I'm playing the odds. Hope this helps pt