1930s Art Nouveau Gold Tone Geometric Pattern Metal with Turquoise Glass

Deco collar-style gold tone metal/brass brooch with molded turquoise glass & c-catch clasp. The clasp suggests it may be a French. Gold tone metal has a geometric pattern and is showing some wear & discoloration. Vintage condition- normal surface wear. No other flaws to note. 1930s, circa 1900, boho chic, vintage, antique, asymmetrical pin brooch, c-catch on pin, minimalist, vintage brooch, turquoise glass, gilt metal bracelet, Regencycore,