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Abalone: A group of ancient marine gastropods (snails) that have a unique, flattened shell with small holes (gonopores), that inhabit many of the world's temperate waters. Their shells display beautiful and iridescent mother of pearl shell. The family is Haliotidae and the genus is Haliotis.

Abalone blister pearl: Nacreous natural half-pearl formed on the inside of an abalone shell...

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Mabe: Originally, the Japanese trade term for an assembled blister pearl grown in Pteria penguin. In Japanese, that mollusk's name is mabe-gai, hence the pearl's name. Today, the word is used to describe any assembled blister pearl.

Maeshori: Originally in Japan, a deep-cleaning process used before bleaching
Akoya cultured pearls. Today, "maeshori" (literally, "before treatment") retains...

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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...

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Occidental pearls: Historical term used to describe natural pearls from Mexico, dates to the 16th century but fell from usage after 1930.

Oil pearls: Imitation pearls worked from the columella (see) of the Trochus and Turbo snails.

Oiling: Process of soaking a natural or cultured pearl in warm oil to diminish the visibility of cracks.

Opera necklace: Pearl necklace measuring 28 to 35...

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PAPPE: Philippine Association of Pearl Producers and Exporters.

Paraffin: A wax often used to fill the cavity of cultured and imitation blister pearls.

Parasite theory: Natural pearl growth theory suggesting that parasitic invasion of a mollusk's shell, typically by a boring worm, catalyzes natural pearl production. Postulated in the mid-19th century, it was the first theory that...

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Quadrula metanerva: Natural pearl producing freshwater mollusk found in the United States, otherwise known as the monkeyface or knobbed rock shell.

Quadrula nodulata: Natural pearl producing freshwater mollusk found in the United States, otherwise known as the wartyback, two-horned pocketbook, pimpleback, winged pimpleback, nodule and winged orb shell.

Quadrula pustulosa: Natural pearl...