The Diamond cut is the quality the breathes life into the stone. The allure and beauty comes from the diamonds fire, sparkle and brilliance. By far the most important C in the 4 C’s of Diamonds. These are the major components that attribute to the Cut grade.
via GIA “The major components, from top to bottom, are the crown, girdle and pavilion. A round brilliant cut diamond has 57 or 58 facets, the 58th being a tiny flat facet at the bottom of the pavilion that’s known as the culet. The large, flat facet on the top is the table. The proportions of a diamond refer to the relationships between table size, crown angle and pavilion depth. It is important to note that a wide range of proportion combinations are possible, and these ultimately affect the stone’s interaction with light and how attractive the diamond is to the person viewing it.”
An important wording to point out ” wide range of proportion combinations are possible”. Sometimes the most ideal numbers don’t add up once you add up all the angles and attributes. Each stone is different. This especially holds true to Fancy shapes(anything other than a round diamond).
Round diamonds are the easiest to buy regarding CUT. Gia offers a cut grade only for Round Diamonds. All Other Shapes like Princess, Emerald Cushion don’t have an official cut grade. You have to evaluate the stone by eye and various elements such as table and depth percentages. If this is confusing, please contact me here so I can guide you.
James Allen, Blue Nile and Brian Gavin all have their signature line of cuts. If you are buying round you may not need to go there, however for any shape such as Princess, Cushion, etc. It’s not a bad idea to look. Pricing is fair for the quality.
Brain Gavin has its Signature Diamonds Cut Line which often come with a AGS Diamond Certificate. Its the only certificate focusing on light performance of a diamond. Brian Gavin is a master diamond cutter that is known for the best cuts. I Highly recommend a Fancy Shape Diamond(Princess,Cushion, Emerald, Oval ETC) to have a AGS Certificate.
James Allen doesn’t have a signature series but that doesn’t matter. In there filters for diamond search, you can put AGS diamond certificate. This means any fancy shape diamond with a grade of O (ideal) means its a brilliant light dazzling diamond.
Your Fancy Shape Diamond(any diamond other than round) wont display a cut grade, you must click on AGS diamond certificate picture and read.
See sample below
A signature series is nice because it takes the guess work out of it. But not always necessary to find a beautiful diamond. In the end you must gauge price with attributes. I give my clients options for the top 3 diamond providers so they can compare offerings. Each company has their strengths.