… Coral and similar materials, unworked or simply prepared but not otherwise worked; shells of … crustaceans or echinoderms and cuttle-bone, unworked or simply prepared but not cut to shape, powder and waste …
Explanatory notes
… 05.08 ‑ Coral and similar materials, unworked or simply prepared but not otherwise worked; shells of … i.e., coral not having undergone processes extending beyond simple cutting. (3) Shells, unworked or simply prepared …