a very small percentage are worth a hundred bucks.
Silver coins, unless they are key dates, are only worth bullion prices. A silver dime is worth maybe a buck, at least the last time I checked, which has been a while.
Gold rings are worth a bit more but most are worth only scrap gold prices. It is fun to find them but you have to find a buyer. I sold a whole hand full of gold rings to buy my first decient land detector. I had a lady at work though that would give me fourty bucks for a wedding band and I sold her some.
Some people make huge finds but that is not what most of us are in the hobby for.