Nacre thickness is probably
Nacre thickness is probably the most important factor to consider when buying white pearls. Nacre is the crystalline/organic substance that is excreted by the oyster or mollusk when an irritant or nucleus enters its shell. This substance coats the irritant in layers, until it becomes thick. This coated irritant or nuclei becomes the pearl.
Nacre thickness differentiates a high-quality pearl from a low-grade one. The thicker the nacre coating, the more durable and long-lasting the pearl is. Pearls with thinner nacres usually do not maintain their luster over the years and may in fact chip off.
Luster refers to the reflective quality of the pearl. The pearl has a mirror-like surface and the quality of its luster is directly affected by the thickness of the nacre. The thicker it is, the deeper the shine. High-quality white pearls reflect light and the surrounding objects best.
Surface texture refers to the clearness and smoothness of the pearl. It is the near absence of imperfection on the surface. No pearl has the perfect surface, but minimum and nearly imperceptible flaws affect its overall look and value. Pearls are graded depending on its imperfections, like spots, bumps, discolorations and other irregularities that show on its surface.
The size of the pearl is determined by its diameter and is measured in millimeters. Tiny pearls measure from 1mm and under while bigger pearls can reach a diameter of as much as 20mm, just below an inch. With all things being equal, size can mean a huge difference in the value of a pearl. The bigger ones, of course, fetch the higher price.
Pearls are never perfect. If one such is found, it is probably the rarest and the most expensive. Because pearls follow the general shape of its irritant or nucleus, it can come in a variety of shapes, from the spherical to the symmetrical to the baroque. Which one you pick for your pearl collar will depend on your preference.
Color and overtone
White pearls are white, right? Well, not quite. Aside from the similar silver color, there are also white pearls whose main body color is affected by its overtone. Overtones are hints of color that lie on top of the main body color of the pearl. Think of a pearl as a tiny white sphere and its overtone like a slightly colored clear plastic that is wrapped tightly and smoothly over it and you can imagine how slightly different the white would appear.
White pearls could have one or more overtones. These can enhance the beauty of white pearls and provide a unique glow to its iridescent quality. Some white pearls, for example can have pink or yellow overtones. Which one you choose is really just a matter of personal taste.
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