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Tahitian Pearls Defined

Tahitian pearls are bead-nucleated pearls grown in the gonad of the Pinctada margaritifera mollusk in French Polynesia.

Tahitian Pearls - Among the Most Beautiful in the World

Tahitian pearls are produced in the black-lipped oyster Pinctada margaritifera, in and around Tahiti and the French Polynesian islands. This oyster itself is quite large - sometimes over 12 inches (30 cm) across and weighing as much as 10 pounds (4.5 Kg) - which often results in much...

By C. Denis George Abstract by Anna Kerrig

Historical Aspects on the Early Discovery of the Pearl Cultivating Technique

Japanese scientists, Nishikawa and Mise are typically recognized for discovering the technology that led to cultivating spherical pearls. C. Denis George was an Australian enthusiast who challenged the credit given to the Japanese for this discovery. George argues that Nishikawa and Mise's step-father were first exposed to successful pearl cultivation at Thursday Island...

Measuring Pearl Quality
Pearl quality and thus, the value of a pearl is measured according to a combination of several varied factors are: the type of pearl, the thickness of its nacre, its luster, the cleanliness and texture of its surface, its shape, its color, and its size.


Because the pearl is a naturally occurring organic gemstone, created by living creatures, these factors can and do vary widely. Although all of them affect the ultimate value of a given pearl, some of the factors are...

Pearl Nucleus Defined
A pearl nucleus is a bead or other object implanted into the gonad of a marine mollusk or into an existing pearl sac in the gonad or mantle of a freshwater mussel around which nacre deposition occurs.

The Pearl Nucleus and Nucleation/Grafting
Pearl farms vary depending on the type of mollusks being produced. But the one thing all pearl farms share is the process of nucleating the mollusks to produce a pearl. Every cultured pearl produced commercially today, except for...

Pearl-Producing Mollusks (Pearl-Producing Bivalves)
Mollusks represent one of the world's earliest forms of animal life, and date back over 550 million years. Actual pearl-producing mollusks first appeared 530 million years ago, when mollusks developed shells. The scientific discoveries of pearl producing mollusks illustrate the intrinsic and irrefutable value of the world's most historically treasured organic gem.

(A fossilized shell of an Abalone from Baja California, Mexico, photo...

Pearl Size Is Measured in Millimeters

A pearl's size is measured according to its diameter in millimeters. Sizes range from 1 millimeter or less, in the case of very tiny pearls, to as much as 20 millimeters (more than 3/4") for large South Sea pearls.

The Average Pearl Size Today is 7 Millimeters

Most pearls sold today, however, are in the 7.0 to 7.5-millimeter range. Akoya pearls greater than 8 millimeters are considered extremely rare. (The largest pearl an akoya oyster can produce is...