Victorian Cameo?

by cristal
(Los Angeles)

Hi! I inherited this shell cameo from my Spaniard greatgrandmother. The clasping on the back is very smartly made. The end, shaped like a heart slides out, allowing thepin to open by pushing it down and out. I've never seen one like it. Can you please let me know more about it and what era it might be from?

Thanks!
-C