Mussel Shell Carved Butterfly 14K Gold Filled Pendant | 1" Long | Silver Black |Silver Black Mussel Shell Carved Butterfly 14K Gold Filled Pendant. This silver black Mother of Pearl pendant is fashioned from Mussel Shell that is especially abundant in rivers of the central U. S. and has a shell lined with mother of pearl. In Native American cultures. Different Native American tribes interpret butterflies in their own way, but generally, they're thought to represent change and transformation, comfort, hope, and positivity. A