GIA to Introduce Premium & Standard Grading for Lab-Grown Diamonds Starting October
From October 1, the Gemological Institute of America (GIA) will discontinue traditional 4Cs grading for lab-grown diamonds and shift to a two-tier system: “Premium” and “Standard.” Starting October 1, 2025, the Gemological Institute of America (GIA) will phase out its traditional 4Cs grading