… Pearls, natural or cultured, whether or not worked or graded but not strung, mounted or set; pearls, natural or cultured, …
Explanatory notes
… natural or cultured, whether or not worked or graded but not strung, mounted or set; pearls, natural or cultured, … or blue). They are usually round, but sometimes half round (button pearls) or irregular (baroque or blister pearls), and … This is done by fixing a bead of mother of pearl in a sac cut from the mantle of one oyster and then inserting this …