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Article Title:
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What's in the Name – Tahitian Pearls

Article Description:
====================

With the exception of Poe Konini, Poe Rava and Titian, the Cook
Islands Black Pearls, Black-lipped Pearls, Black Pearls, Black
South Sea Pearls, Black Tahitian Pearls, Grey Pearls, Tahitian
Black Pearls, Tahitian Cultured Pearls and Tahitian Pearls are
all common names used interchangeably when referring to pearls
cultured in the black-lipped pearl oyster (pinctada
margaritifera) or Te Ufi.


Additional Article Information:
===============================

1035 Words; formatted to 65 Characters per Line
Distribution Date and Time: 2007-01-16 11:12:00

Written By:     Yvonne Mal
Copyright:      2007
Contact Email:  mailto:[EMAIL PROTECTED]



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What's in the Name – Tahitian Pearls
Copyright (c) 2007 Yvonne Mal
Fusion Pearl
http://www.fusionpearl.com



With the exception of Poe Konini, Poe Rava and Titian, the Cook
Islands Black Pearls, Black-lipped Pearls, Black Pearls, Black
South Sea Pearls, Black Tahitian Pearls, Grey Pearls, Tahitian
Black Pearls, Tahitian Cultured Pearls and Tahitian Pearls are
all common names used interchangeably when referring to pearls
cultured in the black-lipped pearl oyster (pinctada
margaritifera) or Te Ufi.

The Black-lipped Pearl Oyster

The black-lipped oyster, a nacreous secreting mollusk (mollusc),
is considered indigenous to the Polynesian Islands. Today, and in
all likelihood due to the pearling industry, this oyster's
habitat and culturing locations extend from the warm salt waters
of Asia to Baja California, to the tropic and sub-tropical waters
of the West Indies. They can be found on the Pacific side of
Japan; in the Cook Islands Atolls, the Tuamotu Archipelago, the
Gambier Island groups of Micronesia and Polynesia, the Persian
Gulf, the Indian Ocean, the Gulf of Mexico, Australia and Fiji.

The pearl oyster was hunted to near extinction during the in the
19th century for its shell's iridescent inner lining then used
to create mother-of-pearl buttons. Today, this pearl oyster is
more highly prized for its ability to continuously and rapidly
secrete layers of nacre on to introduced irritants much like it
does to smooth its shell and to thicken it against parasites; as
well as its ability to nacre a palette of colors. Its
mother-of-pearl (nacre) remains a source for buttons, jewelry,
musical instruments, interior floors, exterior walls, doors,
ceilings, countertops, etc.

Pearls (Natural vs. Cultured)

In a pearl oyster, a miniscule parasite lodged in its tissue can
result in a rare, natural pearl when the oyster secretes nacre
over the parasite to smooth the irritation. Highly valued as gems
for their translucence, luster and delicate play of surface
colors, the pearl is hard mass consisting of the same material
(mother-of-pearl) as the mollusk's inner shell.

It is said that the method of culturing pearl by intentionally
inserting an object within a mollusk's shell begun in
13th-century China. Today, almost all pearls used in jewelry –
Freshwater or Saltwater; are the by-product of this earlier pearl
culturing discovery. So that the terms we use today, i.e.,
(http://www.fusionpearl.com/TahitianPearlsSouthSeaPearls.html)
Tahitian Cultured Pearls," "Freshwater Cultured Pearls,"
"Saltwater Cultured Pearls," "Akoya Cultured Pearls," "South Sea
Cultured Pearls," etc., refer to pearls created as a result of
intentionally inserting an irritant in the mollusk shell to cause
the secretion of nacre.

Keisha (http://www.fusionpearl.com/Keshi_Pearls.html)Keshi
Pearls: Rare non-nucleus pearls which form when the oyster
rejects the intentional implanted irritant, but continues to
secrete nacre to the area. These pearls, although consisting of
only nacreous concretion, are not considered "natural pearls"
since they were formed as a result of man's intervention. They
are often impossible to tell apart from natural pearls.

4 Levels of Quality - Pearls

Unlike a diamond, the naked eye is used when judging the quality
of harvested pearls. Each pearl is evaluated and sorted according
to its size, shape and surface defects. The four levels of grades
used, by a pearl producer to determine Tahitian Cultured Pearls'
surface quality, are: A, B, C, and D (rejects). This pearl
grading factor is also referred to as the "Tahitian System."

A Quality: The pearl has very slight or no surface defects
visible to the naked eye. Any existing defects are confined to
less than 10% of its surface.

B Quality: Slightly visible imperfections confined to less than
1/3 or 30% of the pearl's surface.

C Quality: Pearl's shows several visible flaws distributed over
less 2/3 or 60% of its surface.

D Quality: The pearl shows visible defects on more than 2/3 or
60% of its surface. D Quality pearls are considered rejects
regardless of luster.

The Infinite Colors of the Tahitian Black Pearls

Color is one of the most subjective criteria used when grading or
selecting the Tahitian Black Pearls (http://www.fusionpearl.com/)
as they are rarely black. In fact, these pearls when truly and
fully black in color are very rare. The term "Black Pearl" was
coined for the oyster in which they are grown – the Black-lipped
Pearl Oyster.

Tahitian Pearls comes in a plethora of colors and exhibits a
multitude of shallow to deep iridescent luster. The colors range
from a single color of black, grey, green, white, silver, cream,
etc., with the majority of the aforementioned colors exhibiting a
multi-mix of iridescent overtones of yellows, pinks, magenta,
peacock, ocean blues, violets, platinum, brown, silver-brown, to
name a few, showing on the surface of the pearls.

It is not known what causes the specie of the black-lipped pearl
oyster to produce a range of colors in its nacre. One may
speculate, however, that environmental factors such as mineral
levels in the sea water, ocean floor contamination and water
temperature; the mantle used to seed the oyster and stress levels
experienced during this process, plankton color and food level
filtered during feeding plays a possible part in effecting the
nacre color secreted by each oyster.

Sizes

Pearl sizes are commonly expressed in millimeters. Common sizes
for round and semi-round Black Tahitian Pearls range from 8mm to
12mm. While sizes can reach up to 16 mm, perfectly round pearls
above 13mm are an infrequent find.

Baroque pearls (drop, semi-drop and oval), being the largest
amount of a farm's output, are much easier to acquire in larger
sizes. Sizes of 8mm to 14mm are easier to find.

5 Common Shapes of the Tahitian Black Pearls

The pearls are sorted into five different shapes of round,
semi-round, semi-baroque, ringed or circle and baroque pearls.

Round pearls can be perfect or almost-perfectly round spheres
with a diameter variation rate of less than 2%.

Semi-round (off-round or near round) pearls are slightly off from
being a perfect sphere and exhibit diameter variation rate of
greater than 2 % but less than 5 %.

Semi-baroque pearls (drop, button, pear and oval) have at least
one axis of rotation allowing it to spin on a tabletop.

Circle or ringed pearls can be any of the aforementioned shapes
and are characterized by regular streaks or concave rings,
perpendicular to their axis of rotation, over more than a third
of the pearl's surface.

Baroque pearls do not have an axis of rotation and are of
freeform shape.




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Yvonne Mal is a Pearl Jewelry Designer and Author 
of articles written for Fusion Pearl.  Do you 
need classic, yet uniquely contemporary and 
exotic, handcrafted Pearl Jewelry?  Visit 
Fusion Pearl for one-of-a-kind exotic 
http://www.fusionpearl.com


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