Help with dark brown stone cameo ring with soldier on it.

by Erin
(Pa)

I have a brown stone cameo ring with some sort of soldier on it. The sides of the band have symbols. Would like to know history or orgin of it? Only know that it may be from the 1930's? Is it something that may be valuable? Help would be very much appreciated. Is a little dirty but detail of the soldier is excellent. Dont want to mess it up by cleaning it. Have more pictures if needed.