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, ...
The Gemological Institute of America, the world leader in diamond grading, will not use its internationally recognised 4Cs (cut, colour, clarity, and carat weight) grading system for laboratory-grown ...
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