Pearl of Tahiti - Tahitian pearl - Definitions
Part 1 - Introduction
This section has been designed as a guide dedicated to the Tahitian
black pearl, also called "Pearl of Tahiti". It includes
all the information you need to carefully select the jewels you
will find while traveling in Tahiti and her islands.
Tahiti
cultured pearls are pearl concretions that are secreted inside
the black-lipped Pinctada Margaritifera, species of
pearl oysters cultivated mainly in the lagoons of French Polynesia.
They consist of thick pearly layers containing organic substances
and calcium carbonate in the form of aragonite.
Tahiti cultured pearls are characterized by a diversity of shapes,
diameters, qualities and several shades of natural colors,
ranging from pale gray to anthracite black.
In French Polynesia, the trade designation "Tahiti Cultured
Pearl" is reserved exclusively for cultured pearls obtained
from a grafting of the locally cultivated Pinctada Margaritifera
pearl oyster. Such pearls have a continuous pearly layer over at
least 80% of their surface and do not reveal either the nucleus
or the seed of the nucleus.
Any other merchandise that does not satisfy such criteria may not
be called a "Tahiti Cultured Pearl" and will be deemed
a rejected pearl.
Rejected pearls official criteria :
- pearls whose milky loss of normal pigmentation marks
over more than 20% of its surface
- pearls with no luster, resulting in a dull surface
- pearls with deep imperfections on more than half of
their surface
- pearls with both deep and light imperfections on more
than half of their surface.
Copyright
© 1996-2001 GIE Perles de Tahiti
images Copyright © Pacific-image 1997
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