Pearl Education

Here's a list of Pearl-Guide.com terms that might help you understand the site's terminology better.

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Japan Black Pearl Promotion Association: Founded in October 1993, the association promotes cultured pearls from French Polynesia in Japan.

Japanese lingah: Popular name for the Pinctada fucata martensi mollusk.

Japanese pearl mollusk: Akoya pearl mollusk.

Jewelmer: Philippine producer and wholesaler of South Sea pearls, primarily those produced by the gold-lip Pinctada maxima pearl...

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L-grade: Letter grade assigned to low-grade pearls by Japan's Pearl Inspection Offices from 1952 to 1998.

La Paz pearls: Natural pearls from the Gulf of California, Mexico. Produced by the "Panamic Black Lip Oyster" or Pinctada mazatlanica.

Lacquer coating: Temporary coating applied to some imitation and cultured pearls to enhance their color and luster.

Lake Biwa: Located northeast of...

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Cabochon: In gemology, a usually round or oval shaped gemstone with a domed top and flat bottom; hence, a pearl of that shape.

Calcareous concretion: Whether nacreous or not, all pearls are calcareous concretions.

Calcite: A form of natural calcium carbonate that, together with aragonite and conchiolin, makes up the structure of nacre.

Calcium carbonate: Pearls are mainly composed of...

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Dadjin: A 19th-century pearler's basket used to hold mollusk shells and a knife.

Dana: Historical Persian quality factor describing a perfect round natural pearl larger than 7 mm.

Diffraction: One of the ways nacre layers interfere with light, causing light to split into its component colors (the spectrum), one or more of which can be displayed as overtone and/or orient.

Dobo pearl: An...

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Faceted cultured pearl: Pearl carved to create rhombic or triangular surface shapes that produce a sparkling optical effect when the wearer moves.

Fancy colors: Most often associated with cultured freshwater pearls, consist of unusual colors like intense pink, orange or plum.

Fancy shapes: Most often associated with cultured freshwater pearls, consist of unusual shapes like bars, crosses...