Vintage large Art Deco Bauhaus design green glass and silver tone (probably low grade silver) brooch with trombone clasp

Lovely large vintage Art Deco brooch with geometric Bauhaus design in green glass and silver tone. This piece is lovely and heavy, with all three circles being made of thick glass in two shades of green and an enamelled chrome, creating this simple and elegant design. The metal settings feel like silver and polished as if they were silver, but did not show positive for a high silver content when acid tested.

The brooch is in good vintage condition with only a small amount of age related wear. Please examine photos carefully for a full condition report and bear in mind the piece is probably 90 years old!

It has a length of about 2 1/4 inches and a width of 2 inches and fastens with a trombone clasp and pin (which suggests it was made in Europe, and is most likely French made).