Rare Ring Design Vintage Art Deco with Opal and black stone 925 silver size 8

What I believe to be an Opal is stunning with high pink flash. The black stone is miniscle so I cannot tell what the gem is. Rare art deco style. Slim band. Very good vintage condition. Has a delicate yet elegant flair. If I am correct I believe it to have been made in Germany. The centre had a brass colour insert. I have not had it appraised.