What color diamond is the best?
The finest diamonds are either colorless or have “fancy color.” The perfect colorless diamonds are class D, but if you want excellent stones you can get class E or F, which are still colorless. Class G, H, or I stones are larger for the same cost and are near colorless. If you prefer a faintly tinted stone, classes J, K, L, or even M will display a slightly yellow tint. Stones with “fancy color,” such as fancy yellow or pink, are extremely rare and cost accordingly.