hopefullgold,
The details you need about your rings will be stamped on the inside of them. If no markings then only costume jewelry. Also put a magnet next to them to see if it attracts them, if so then costume. Job well done though as you detected them and got them back out of the ground and that is always good for a rush. Hope they are silver or platinum or even gold would be ok.......................63bkpkr