Frequently asked questions

What pearl grading system does GIA use?


GIA uses a comprehensive standard it has 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 that everyone can understand. The GIA 7 Pearl Value factors are: Size, Shape, Colour, Nacre, Lustre, Surface and Matching.

Find out more about how GIA identifies and classifies pearls.

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