Few categories of cultured pearls have changed as rapidly as freshwater pearls. Over several decades, freshwater perliculture has evolved from a non-nucleated (solid-nacre) process producing mostly small, baroque shapes into an industry now centered on bead-nucleated production.

When this course was first written in 2016, bead-nucleated freshwater pearls were still relatively new and not widely understood outside the trade. At the time, it was reasonable to treat traditional tissue-grafted pearls and bead-nucleated pearls as separate categories.

While freshwater pearls are often described as non-nucleated or bead-nucleated, a more precise technical distinction is whether the pearl develops within the mantle or deeper within the body of the mussel. Both frameworks are useful: one describes the presence or absence of a bead, while the other describes where the pearl forms.

Today, bead-nucleated freshwater pearls account for the majority of freshwater pearl production in China, and both non-nucleated and bead-nucleated production must be understood together to accurately reflect current industry practice.