Diamond Standards

【USA】GIA Redefines Lab-grown Diamond Grading Standards: Discontinuation of 4Cs System Enhances Differentiation Between Natural and Lab-Grown Diamonds

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Editor’s NoteThe Gemological Institute of America (GIA) has announced a historic change to its grading system for lab-grown diamonds, moving away…

【Hong Kong SA】GIA Redefines Lab-grown Diamond Grading Standards: Discontinuation of 4Cs System Enhances Differentiation

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Editor’s NoteThe Gemological Institute of America (GIA) has announced a historic change, stating it will cease using the traditional 4Cs system to…

Updated CIBJO Blue Books Available For Downloading

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Editor’s NoteThe latest editions of all six CIBJO Blue Books, the definitive standards for diamonds, colored gemstones, pearls, coral, precious…