A yummy grape purple teardrop of genuine abalone shell, in a simple pendant necklace. The shell is two-sided, with the back side lighter in shade with more blue hues (see photo 3).
Matching earrings can be found here:
https://www.etsy.com/listing/110137955/purple-shell-earrings-paua-abalone
The abalone is 21 mm (a bit under 1 inch) long, wrapped in sterling silver. The 40 cm (16 inch) lightweight sterling silver chain ends with a standard spring ring clasp.