Antique Coro Jelly Belly Pin C Clasp Brooch Channel Set Stones Signed 1"

Great condition C clasp and this signature were used in 1919 Approx. 1"x .75" Metal and stones not tested so not sure if the metal is real gold or not MAIN STONE COLOR: DEPENDING ON THE ANGLE YOU LOOK AT IT, IT CHANGES FROM PURPLE TO BLUE CHANNEL STONES: DARK GRAY-LIKE SMOKEY QUARTZ Metal and stones not tested