First you need to decide on a carat weight or price range. The next thing we recommend looking at is the cut. If the cut is off, the diamond will not sparkle right. Next we go to color. A lower color will result in the diamond beginning to look yellow. And last, but still important, we look at clarity so long as the diamond has a clarity of I1 and above. If it is below the I1 clarity, the order we prefer in choosing the diamond will be different.