Hi, I have a dark blue stones with diamonds surrounding them, the hallmark has worn away but I know it said 375, how can I get it valued with no hallmark any ideas? Also, on another piece I have a hallmark bearing the symbols of EV a crown and a lion then an O, any ideas on this as well? Thank for your time in reading and answering.

Hi, Emma York!

A jeweler or auction service should be able to help you. If you post images here, someone who is a member of this site might be able to give you a general idea. If you want an evaluation that's official though, someone who is an expert who is able to see them in person would be the best way to go.

Thanks!