Diamond Rings

[Gille]

Last summer I was lucky enough to find 3 diamond rings. 2 within feet of each other. Going from left to right. Found the first 2 in a large park as I MDed along a sidewalk. The 1st is 18K HGE (electroplated) and a makers mark of an "A" inside a circle. I haven't been able to find whos' makers mark this is. The diamond I believe is a 1/4 carat. The second ring is missing the center stone but has 2 small diamonds. The third ring was found in a school yard right behind a basketball hoop. I always try to imagine where people would put down jackets and such around B-Ball Courts, Tennis Courts, etc.. The ring is only stamped 14K. It looks like a diamond, but being a ring only a child could wear makes me weary about it.

They have been just sitting in my finds box not doing me any good. I am definitely not a jewelry expert. How can I go about selling these pieces without getting shafted. Any advice would be greatly appreciated.