Glossary of Pearl Terms N

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Nabatee: Arabian term for sugar used to describe pearls from the Persian Gulf that had a slightly off-white, yellowish color.

Nacre: Aragonite and calcite platelets bound together by conchiolin that completely compose bivalve and abalone natural pearls, Keshi, tissue-cultured freshwater pearls, and the coating on the nucleus of bead-cultured and bead-and-tissue-cultured pearls.

Nacreous: Composed of nacre.

Nacre thickness: Measured in whole and decimal fractions of millimeters, the depth of the nacre layer on the bead nucleus of bead-cultured and bead-and-tissue-cultured pearls. Not a consideration for natural and cultured pearls composed entirely of nacre (see).

Nassau pearl: Historical term for conch pearl.

National Federation of Pearl Cultivators Cooperative Association (Zen Shin Ren): Japanese association that organizes Hama-age auctions.

National Pearl Research Laboratory: Established in 1952 in Mie Prefecture, Japan, with the intention of improving pearl culture technologies.

Natural pearl: Organic gem created in a mollusk without human intervention.

Nautilus pearl: Natural pearl from Nautilus pompilius, extremely rare. Osmeña imitation pearls are often incorrectly called nautilus pearls.

Nimro: Historical Persian quality factor for natural blister pearls.

Nishikawa, Tokishi: Credited with Tatsuhei Mise (probably erroneously), with discovering the bead-and-tissue method of whole pearl culture.

Non-beaded cultured pearl: Cultured pearl grown without a bead nucleus.

Non-nacreous pearl: Natural pearl lacking a nacreous surface layer. Also referred to as "Porcelaneous Pearls".

Non-nucleated cultured pearl: Cultured pearl grown without using a bead nucleus.

Nucleus: Shell bead implanted inside a host mollusk, most often with a tissue piece, to become the core of a cultured pearl.

Nuggets: Semi-round pearls that resemble gold nuggets.
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