Art Deco Brooch is just Brilliant

This one! Yes, this one!! It’s long & elliptical, rich gold color and shows off against any dark background just as good as something Liz would be proud to wear. There are no markings I can see. It’s not new, it’s vintage, but I don’t know how vintage. It has a safety catch that works well. There are signs of wear on the back. The stones or crystals are flush set & are brilliant. I don’t know what they are. Entire piece is 3” long