Ring with no Hallmark

I bought a second hand amethyst ring in a Crystal shop a few day’s ago it seems to be set in silver Well it’s not turned my finger green, but it has no hallmark all, it has the mark CRYS which I assume means it’s crystal.

Is is possible for this ring to be silver but not hallmarked?

Thankyou for any help you can give me

Clair :smiley:

That hallmark is for Crystals UK (https://www.crystalshop.co.uk/) they have many shops all over and specialize in semi precious stones and gems. And I believe it is sterling silver they use. I’ve never had an issue with any of their jewellery turning me green