Champagne diamonds are unsurprisingly naturally colored diamonds that are produced in a wide variety or range of colors from light straw to rich cognac. The generally referred 4C's of color, cut, clarity and carat weight apply to the naturally colored diamonds just as they apply logically to the colorless diamonds except for the concentration of color, plays a superior part in the assessment of the stone. Argyle Diamonds are precious stones created for the following scale purposely for champagne diamonds. The diamonds are graded on a scale of C1-C7 color scale. C1 and C2 represent light champagne, C3 and C4 medium champagne, and C5 and C6 dark champagne. The conjure cognac diamond is ranked C7.