Art deco Aurora borealis silver pendant

Its always hard to photograph an aurora borealis stone. So on the picture the stone looks much more dirty than in reality.
I found this little pendant some months ago together with a silver pocket watch.
Its nothing special, but I like it.
An aurora borealis stone is a stone that has been coated with thin layers of metal to enhance brilliance and reflective color quality. The method of coating the stone involves vaporizing metals in a vacuum.
As it has an aurora borealis stone, I know it was manufactured after 1955.
Hope you enjoy it!