Pink Conch Shell 10k Gold Cameo Bar Pin

Antique Art Deco Jugendstil ear bar pin that is of solid 10k yellow gold.
It is set with a hand carved pink conch shell cameo that greatly needs to be cleaned. It has a small crack at the very top and on the back it has blue ink. I have not cleaned it at all.
The pin is hallmarked JJ and has 10k on the pin.
Brooch measures 1/2" by 1 3/8".
It weighs 1.8 grams.
Clasp is simple "C" clasp that does not lock.