If you click on the image of a sample “Rap List,” you will see four separate grids. Each one is for a different size category. The four categories shown on this sample are 0.90-0.99, 1.00-1.49, 1.50-1.99, I 2.00-2.99.
Each grid is a matrix of color against clarity. To find the “Rap Price” for a given diamond, you need three pieces of information: the size category, the color, and the clarity.
Prices listed are always in hundreds. Let’s say, for example, that you have a 1.55ct H color SI1 clarity diamond. The “Rap Price” for that diamond would be $7,600 per carat. But finding the Rap Price for your diamond is only the beginning of pricing a diamond.