Like diamonds, pearls are graded according to the different qualities they possess. Overall, pearls are graded either A, AA, or AAA, with AAA denoting the highest quality. If a pearl falls between the A and AA grades, or the AA and AAA grades, a plus sign (AA+) may also be used. Pearl Quality
The environment in which pearls are grown affects their quality. A pearl's grade depends upon its luster, shape, and surface appearance. Luster refers to the reflection of light through the outer layers of the pearl. Larger pearls have more layers, and so have greater luster. High luster receives a higher grade than low luster.
Round pearls are the most difficult to grow, and thus are considered more valuable and receive a higher grade than those that are off-round. Although the classic pearl shape is round, fashion pearl jewelry often features unique pearl shapes that are just as beautiful and captivating as round pearls.
The pearl surface is graded according to the numbers and kinds of imperfections on the pearl. A pearl's blemish may appear as a bubble, a line, or a dark spot. Ninety-five percent of the surface of an AAA pearl is free from defects.
When you're shopping for pearl jewelry, keep in mind how pearls are grown and graded, but make your own decision about the qualities are important to you.
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Orignal From: Like diamonds, pearls are graded
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