Vintage Florenza Cameo Brooch Carved Shell Faux Seed Pearls

Vintage Florenza cameo brooch in Victorian Revival stylehand carved shell measures approximately: 1" x 5/8" brooch measures approximately: 1 3/4" x 1 1/4" Marks: FLORENZA, (copyright symbol) ..... indicates 1955-1981 10k gold plating over an unknown base. There is an open hook above the pin clasp on the back. I am not sure how this would have been used. SHIPS IN A SMALL LINED GIFT BOX FOR EASY GIFT GIVING!