Abalone shell (can be used as a censer)

Different colour abalone shells. In reality much more rainbowy inner side than it looks in the photo. Pretty large (you can see the smallest shell in my hand in the second photo).

Green Abalone shell (Haliotis Fulgens) - two top shells
Rainbow Paua Abalone shell (Haliotis Iris) - bottom left
Abalone shell - pearly bottom mid & right