GIA diamond cutting grades for a round brilliant cut diamond will range from Excellent to Poor. According to JCK Online Magazine “The addition of a cut grade to the GIA Diamond Grading Report and GIA Diamond Dossier for round brilliant diamonds is the result of more than 15 years of research and testing, including sophisticated computer modeling and ray tracing of more than 38.5 million proportion sets.” In August 2005 the GIA announced the introduction of a new “cut grade” to its grading reports. When looking at AGS diamonds, we recommend only considering Ideal cut diamonds for the best quality. Cut quality is graded by the AGS as Ideal, Excellent, Very Good, Good, Fair or Poor. The AGS cut grade chart also includes an Ideal grade. Entering light escapes from the sides and bottom of the diamond. Poor cut diamonds yield nearly no sparkle, brilliance or fire. Diamonds of a Fair cut may be a satisfactory choice for smaller carats and those acting as side stones. These diamonds provide beauty at a lower price point.įair cut diamonds offer little brilliance, as light easily exits through the bottom and sides of the diamond. Good cut diamonds showcase brilliance and sparkle, with much of the light reflecting through the table to the viewer’s eye. To the naked eye, Very Good cut diamonds provide similar sparkle to those of Excellent grade. A large majority of the entering light reflects through the diamond’s table. Very Good cut diamonds offer exceptional brilliance and fire. Because almost all of the incoming light is reflected through the table, the diamond radiates with magnificent sparkle. Here are the GIA cut grades for round diamonds: ExcellentĮxcellent cut diamonds provide the highest level of fire and brilliance. Diamond Cut Grade ChartĪ professional gemologist at the GIA reviews each diamond under magnification to determine the Cut grade. Mike followed that up by spending years buying and selling diamonds on the wholesale market as well as selling tens of millions of dollars worth of diamonds to diamond retailers. Mike started from the bottom, sorting and evaluating hundreds of thousands of diamonds to learn every facet (pun intended) of diamond quality and value. The author of this article, our CEO, Mike Fried has over 20 years of experience in the diamond industry. To help you with the diamond buying process we lean on our expertise and experience. In reality, the diamond will have no brilliance and is very poor value. For example, this diamond from James Allen seems like a great find, as it is 6% cheaper than this diamond from James Allen. If you ignore it, you can make an enormous mistake. Is there a difference between diamond cut and diamond shape?īottom line recommendations when looking at diamond cutĬut is possibly the most important of the 4Cs. What are the prices for different diamond cuts? What proportions of the diamond cut are important? If you are interested in different diamond shapes, go to our diamond shape article. Diamond cut refers to the quality whereas diamond shape refers to the pattern/arrangement of the diamond. You will often see diamond cut and diamond shape used interchangeably, but they are two very distinct meanings. How these different characteristics balance out determine how light will travel through, and refract, to give that signature sparkle we expect from a diamond. The better the cut, the more fire and brilliance you will see. Diamond cut refers to the proportions and technical specs that determine how brilliant a diamond is. We would say that diamond cut is the most important characteristic. Diamond cut is one of the four main quality characteristics known as the 4Cs.
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