www.925-1000.com

Dear colleagues,

I bought this ring in street market in St.Petersburg, Russia. But I can't understand the hallmark, it is partially destroyed. Thank you much for any ideas.

Additional photos with USB-microscope







Many thanks for any help!

Dear collegues. I found it. It's Privolzhsk fabric "Красная Пресня" (Red Presnya). I't Russian. And this is not silver at all, just silverplated.

And yes, it is not turquoise, just glass.

Hi Olga,

Thanks for updating the topic, it is appreciated.

Trev.