Expanded Nacre Scale Added to All Pearl Classification Reports by GIA
As a significant improvement to its well-known comprehensive pearl classification system, the GIA 7 Pearl Value FactorsTM, the Gemological Institute of America (GIA) is implementing an extended method of assessing nacre on all pearl classification reports. In the past, GIA categorized nacre as either “acceptable” or “unacceptable” depending on a number of criteria. “Unacceptable” indicated […]
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