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GIA uses a comprehensive standard it developed over a 60-year period of ground-breaking research on pearls. The GIA 7 Pearl Value Factors™ provide a systematic way to evaluate pearls of all types, and to describe their quality in a way everyone can understand. The GIA 7 Pearl Value factors are: Size, Shape, Color, Nacre, Luster, Surface, and Matching.
Learn more about how GIA identifies and classifies pearls.