The 4Cs—carat, cut, color, and clarity—are the foundation of every diamond quote and price list. Carat measures weight, cut controls sparkle, color runs from D to Z, and clarity shows how clean the diamond is under magnification.

B2B buyers rely on the 4Cs to compare stones quickly, build matching parcels, and meet exact client specs. For colored diamonds, hue and saturation become even more important, so understanding the 4Cs helps suppliers price both white and fancy color diamonds accurately.