This antique/vintage 10K white gold filigree bow pin/brooch is marked on the C clasp.  The hinge and clasp work perfectly.  There is a slight bend in the pin which does not affect the action of the closure in any way.  The pin is 2" in length and about 1/4" in width.  The amethyst stone is set in a square frame in the middle of the brooch.  Circa 1910-1920.