Approfondimenti The 4C system 11/07/2025 / 15/01/2026 by How does diamond grading work? Diamond grading is based on the international “4C” system (Carat, Color, Clarity, Cut), defined primarily by the Gemological Institute of America (GIA) to determine a diamond’s quality and value. The factors include weight (Carat), absence of color (D–Z), clarity (from FL/IF to I3), color (from D to Z), and cut […] Read more »
