Museum Quality Big Old Vintage Carnelian Shell Cameo ` Brooch Pendant 1910 circa. Gold or GF

This cameo brooch measures is 52 mm x 44 mm. Weight is 14.72 gr. , and set in a filigree gold or gold filled bezel. The shell is free from any breaks, cracks, or chips, and has some gorgeous coloring. The detail is very crisp and sharp and the lady is quite striking. Created in the beginning of XX century - original, vintage piece. Not sure about metal. Mark as “1•20 Gold 12K”. Pin is not original. Everything works perfectly fine.