While there is no one approved grading system for pearls, many pearls are graded as A, A+ AA, and AAA. Dealers may offer certificates noting their pearls fit these guidelines. Just remember these grades are not recognized by any official organization. A good rule of thumb is: The lower the pearl's grade the less luster and quality the pearl will have. For example, a grade A pearl might have little luster and some surface markings, while an AAA pearl will have a very high luster and an ultra-clean surface. Most of the higher grade pearls do not end up as necklaces, but are used for designs highlighting unique and beautiful individual pearls. These unofficial grades usually apply to saltwater cultured pearls, rather than freshwater pearls, and do not apply to South Sea pearls.

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