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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.
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