925 is a stamp that's inside the ring and it means it's silver. However, if the piece is old enough or depending on the maker, there may be a "maker's mark" on the inside of the band of the ring. Does it stick to a magnet or turn your hand green when getting wet? That's another test. Either way, the ring is beautiful!
Sorry for the trouble I put you through. This is my husband's birthstone and would like to get it. That's why all the questions. I fanned you last night :) Welcome to Listia! I'll be watching this one.