I believe this is gold washed silver, there is a mark on the bottom backside but I cannot make it out.
See photos for this detail.
The frame is primitive and crudely made but the shell cameo is lovely.
It measures 1 1/8" across and 1 3/8" tall. She is a left facing beauty!
It has an hidden pendant loop in the back. The pin works fine.
Needs a cleaning.