I tried a new setting today on the F70. Speed on SL, sensitivity on 1, discrimination on 15, and threshold on -9. That is with the small ellipitical loop. I also notched out the zinc pennies. You should be able to cherry pick the parks and schools in gold and silver jewelry that has been dropped recently. You might lose some silver with the notch. F70 only goes 2-3 inches now, but seems to still be sensitive on gold rings. Anyone tried that setting for jewelry? I have hunted for 38 years now, I found a lot of old coins, but never found any coin worth more than a gold ring, especially at the gold prices of today.