Among the 4C`s, one of the most important is the cut, which profoundly affects how a diamond looks and is one of the most important in determining its price. Consequently, in order to ensure that you make the right decision and one that you will always be happy with, it is imperative that you understand the basics of the Cut grade. The following is a comprehensive guide to everything you need to know when it comes to the diamond cut and how it can help you buy the right diamond. For the sake of keeping our summary concise and easily accessible, we have separated it into two sections, one for Round diamonds and the other for every other diamond shape.
PART 1: ROUND DIAMONDS
The Cut grade on a diamond`s lab certificate is officially only assigned to round diamonds. Diamond certifiers, like IGI, award the grades, from the highest, "Ideal", then "Excellent", "Very Good", "Good" and so on, depending on how closely they match the established dimensions for that specific ct size. Round diamonds are the only cut where all the dimensions can be defined by a set of Ideal measurements and then compared against a set of actual measurements.