Back in Black

Polished melongena, abalones, Alfonso sea urchins, muffin shells, giant green seeds, Swedish oysters, large cowries, blue mussels, turban shells, black rocks, black cockles, sea urchin spines, various land shells, mitre shells, guildfordia yoka yoka, pacific top vase, various volute shells, delphinula shells, black dove shells, black lava sand.

Inner rim: Tropical periwinkle
Outer rim: Limpets