Despite the fact that growth characteristics are universally evident in cultured pearls, the degree of these characteristics is evaluated in the surface quality of an akoya pearl. When all other grading factors are consistent, the fewer blemishes or inclusions visible to the naked eye, the more valuable the pearl.
A - AAA Grading System
Although a universally accepted grading system for cultured akoya pearls does not currently exist, there does exist within the industry best practice standards which utilize a grading system of A - AAA and hanadama.
A strand of hanadama grade pearls is one that has been certified by the Pearl Science Laboratory of Japan as exhibiting the highest quality traits in terms of shape, luster, surface, and nacre thickness.
In order for an akoya strand to be graded AAA all value factors must fall within the top five percent of the quality criteria. AAA grade strands are considered the best, non-hanadama certified strands in the world.
A strand or pearl not meeting the criteria of AAA is one that fails to reach the top five percent of each of the quality criteria. A grade of AA will mean the strand falls within the top 20 percent, and a grade of AA+ would then mean the strand falls between grades AA and AAA.
There is a rapidly-diminishing debate on cultured akoya pearl origin and its relationship to quality and value. It was once believed that only those from Japan were the finest quality and most valuable. Today it is well known that akoya pearls are also produced in South Korea, China, Vietnam, and even Australia. Pearls from Australia and China have been found to have thicker nacre than their Japanese counterparts, and are often of better overall quality. Origin is not a value factor used to grade cultured akoya pearls.
Pearls are different from other gemstones which are produced inside the Earth's deeps. Pearls are created naturally by living creatures which are mollusks. Mollusks have soft whole body inside and a hard outside shell. Mollusks live as freshwater habitats or main land. History about pearls dated back from 530 million years ago. An average of 100,000 living mollusks abound our world today.
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