Any idea on this huge silver ring?

[Critterhunter]

Here's the ring. Depending on who made it by the hallmark it may be worth much more than it's weight in silver. Have to research it or perhaps somebody might have an idea. Barber quarter and a dime next to it for comparison of size. The ring also has three cream colored stones. They are a little loose but there is no damage.

 

[edjcox]

The stones Opals?

 

[Critterhunter]

Don't know. Might be. I'm thinking this big style of ring might be from the "art decko" period when that was popular, if that's what that era was called?