Carat is the metric used for the weight of a diamond. The larger the diamond, the rarer it is and thus more valuable. Although carat weight is correlated with size, a diamond’s measurements are the true way to determine its size.
Color is negatively correlated with its grade, meaning the more color the lower the grade. Typically, less color in a diamond is more sought-after. Color is graded on a scale of D (colorless) to Z (color).
Clarity assesses the quantity, location, and type of inclusions and blemishes in a diamond. Imperfections can be seen with the naked eye or only visible under intense magnification. Clarity is graded on a scale of IF (internally flawless) to I (included).
Cut is one of the most important factors in a diamond with regard to brilliance. The cut of a diamond, its proportions, symmetry, polish, and measurements, all tell how the diamond’s facets will interact with light, making the diamond shine.