GIA Redefines Lab-grown Diamond Grading Standards Discontinuation of 4Cs Grading System Enhances Differentiation Between Natural and Lab-Grown Diamonds
HONG KONG SAR – Media OutReach Newswire – 10 June 2025 – The Gemological Institute of America (GIA), the world’s foremost authority in gemology announced a redefinition in diamond grading on June 2, 2025. Beginning at the end of 2025, GIA will cease using the internationally recognized 4Cs grading system (Cut, Colour, Clarity, Carat) for lab-grown diamonds. Instead, GIA will implement a new descriptive grading system that lab-grown diamonds submitted to GIA will receive simplified descriptors—categorized broadly as either “premium” or “standard” or no grade at all if the quality is subpar. This transformative change marks a historic shift in the global diamond industry, not only redefining the value perception of lab-grown diamonds but also enhancing the differentiation between natural and lab-grown diamonds.
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