Antique Abalone Carved Shell Cameo Pendant

This is a gorgeous antique carved abalone shell cameo pendant. At one time it was a brooch and pendant combo, however the brooch pin has broken off and it is now only able to be worn on a necklace as a pendant. It is extremely beautiful and very high quality. The sterling silver metal frame is signed on the back.  Sterling chain is not original to piece. 

Pendant: 2 x 1 1/2 inches

chain: 18”