Frequently asked questions

What pearl classification system does GIA use?

GIA uses a comprehensive standard it developed over a 70-year period of ground-breaking research on pearls, called The GIA 7 Pearl Value Factors™ (Size, Shape, Colour, Lustre, Surface, Nacre and Matching).

The GIA 7 Pearl Value Factors™ provide a systematic way to evaluate pearls of all types, and to describe their appearance and quality in a way everyone can understand.

Find out more about how GIA identifies and classifies pearls.