



Vintage ring with a light blue stone
I got this little silver ring a while back from a thrift store and thought it had a glass bead in it since it was a bit opaque.
Today I decided to give it a proper clean and realized it might have a real stone. Diamond tester suggested it’s not glass but I’m having a hard time figuring out what it is. The diamond tester bar goes up 2-3 bars while on sensitivity 3-4.
Also noticed a hallmark before the more obvious “925” stamp. Does anyone know what the hallmark is? I can vaguely make out a “c” but not very confident. (Maybe that could give a clue in terms of what the stone is?)
(Posted in Hallmark as well but haven’t got any leads yet.)