A 1 carat diamond is most valuable when it has color classification D and clarity classification AGS 0.
The color of the a diamond refers to its clarity or yellowness. The highest quality diamonds are completely colorless, whereas lower quality diamonds frequently have a slight yellow tint.
The Gemological Institute of America, or GIA color scale, is used to determine diamond color, and it ranges from D (colorless) to Z. (light yellow or brown in color). There are numerous diamond color grades between D and Z, ranging from near colorless to slightly yellow.
Under 10x magnification, flawless diamonds or AGS 0 have no visible inclusions or blemishes. It may have very minor blemishes and marks on the surface.
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