Even if a diamond has just a 0.2° deviation in pavilion angles (41.2°), it WILL impact light performance. When buying diamonds, the ideal proportions matter and precision is required. Even if a diamond just barely failed to meet these proportions, it is an INSTANT REJECTION and you will have to dump the stone. There’s ABSOLUTELY NO wriggle room when it comes to proportions. In fact, it is estimated that 90% of the round diamonds are cut to dismal proportions by choice.Īs a consumer, here’s your bottom line when selecting a round diamond for light performance. Now, with all the technical specifications laid out, you might assume that all the diamonds in the market should be polished to ideal proportions if cutters simply followed a standard formula. In order to confirm light performance, you will need to rely on idealscope or ASET images for analysis.ī’s Ideal Cut Proportions for Round Diamonds Here, I want to highlight that proportions should only serve as an initial filtering process. It will not only help you save time but weed out the badly cut diamonds as well. I strongly recommend that you apply these parameters when searching for your own diamonds. This tighter set of parameters helps to filter diamonds that are the cream of the crop and I personally use it to handpick diamonds for myself. While it is modeled after Tolkowsky’s initial findings and studies from GIA/AGS, my parameters are much more stringent. Over the years of examining and analyzing diamonds, I had tabulated my own set of parameters for selecting a ideal cut round diamonds.
My Personal Criteria is Even Stricter Than Both GIA & AGS Labs They offer the best cut quality diamonds in the world and a wide range of high quality engagement ring settings. If cut quality and the sparkle factor of a diamond matters to you, I recommend that you visit White Flash and Brian Gavin Diamonds.
DIAMOND DIMENSIONS 245 DOWNLOAD
You can download the AGS cutting guidelines here and GIA proportions chart here to do your own comparisons and analysis. However, it has now been scientifically proven that an ideal cut could have proportions outside of this value and diamonds with slightly bigger tables can also achieve ideal optical properties.īoth GIA & AGS had also came up with comprehensive tables of proportions and cutting guidelines. In Tolkowsky’s initial publication, he stated that the ideal cut diamond should only have a table proportion of 53%. If you are looking for a diamond that exhibits superior brilliance and sparkle, scroll down to use MY proven table of ideal cut diamond proportions instead. With modern day research, the Tolkowsky proportions have been further refined.
*Note: The above historical table should be used as a reference only. Source: The Ideal Cut: A Consumer’s Guide. General Proportions For Round Brilliant Cut From Tolkowsky In fact, a diamond could be polished within a range of proportions and it would still display ideal optics. One of the major breakthroughs made was the discovery that ideal cut diamonds do not have to follow a single set of proportions as set forth in Tolkowsky’s original dissertation. With the help of specialized studies and technological advancement, researchers from GIA & AGS had published scientific journals that changed the way we polish and buy diamonds. In more modern times, much has changed as Tolkowsky’s groundbreaking discoveries were further developed upon. Marcel Tolkowsky’s ideal proportions for a round brilliant diamond. Ever since the epic publication, Tolkowsky’s findings were widely applied in diamond polishing by cutters around the world. In his book, he wrote about a set of proportions that would yield in a diamond with maximum beauty, fire and scintillation based on mathematical calculations. Marcel Tolkowsky revolutionized the world of round brilliant diamonds in 1919 when he published his landmark book titled “ Diamond Design“.
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