Shell Cameo that depicts Christ's Acension.Value? Date?

by Sy
(Oregon)

I have this cameo that I believe to be shell that depicts Christ's Acension. I can't find anything on the net close to it to be able to compare. It's in excellent condition with great detail in the carvings. It came with this big angel statuary that holds it and displays it. I was hoping I could get a little help with a value, a date, and maybe some history on it.