Art Deco huge open back set Chrysoprase leaf Berry Marcasite Silver brooch

Gorgeous , Art Deco Marcasite Silver plated brooch with a big, prong,  open back set faceted,   Chrysoprase  stone , resembling Fruit/Berry , attached to a twisted silver stem accented with leafs and a flower studded with Marcasites.
The brooch measures 2 1/2" x 1 3/4" inches at the widest point, and has a long pin stem closure.
The metal work is silver plate over Brass, that shows some wear only at the back. The stone has a tiny fleabite, barely visible  on the bottom edge and one leaf is missing a tiny Marcasite.
The brooch has a n old roll over  secure clasp with an extended pin.
Beautiful Art Deco era  brooch probably made in Germany, but not signed as such circa 1920-30's.