I think Svenga got it!

Good eyes G.!
Yes the other ring has a little enameldamage at the red one too.
And behind this enamel again is a kind of brass.

In all hard to say, but yes, i think too it is a kind of thinn sheet or foil. On both rings this, i call it now so, foil has symetrical structures.
In my opinion real to reflekt and brake incoming light through the very glasy enamel.
And, if i remeber right, brass is one of the best materials to hold enamel.
Thanks Svenga! Thanks G.!
Here some closer pics:

1.JPG (90.68 KB, 334 downloads)
2.JPG (52.22 KB, 336 downloads)
3.JPG (76.11 KB, 336 downloads)

�Eine gewaltt�tige, herrische, unerschrockene, grausame Jugend will ich. Jugend muss das alles sein. Schmerzen muss sie ertragen. Es darf nichts Schwaches und Z�rtliches an ihr sein. Das freie, herrliche Raubtier muss wieder
aus ihren Augen blitzen."