Pearl in shell
This is a fantasy piece, a fresh water pearl in a marine gastropod shell. Both the shell and the pearl have small holes where they have been pierced for use as beads. If you look closely at the photos you can see these. I have three of these available so the photos are representative - yours might be slightly different.
9/16 inch (1.4 cm) wide, 1/2 inch (1.3 cm) deep and 3/8 inch (0.95 cm) tall.