diamond

diamond

In 1919, Marcel Tolkowsky empirically calculated the ideal proportions of a round diamond as part of his Ph.D. thesis in Mathematics.  An "ideal cut," according to Tolkowsky, has the following characteristics:

It should be obvious that finding a Tolkowsky diamond is an expensive undertaking.  To complicate matters even more, recent studies by the G.I.A. have demonstrated that a 59% table yields a more brilliant diamond and larger appearing diamond(as opposed to Tolkowsky's 53% specification).  Jewelers tend to confuse the issue even more, since their version of the "ideal cut" will likely vary from day to day, as their diamond inventory changes.

When using the terminology of ideal cut and diamond certificates it is important to note that only AGS uses the term "ideal cut" with respect to a cut grade. The GIA highest cut grade is a excellent polish and excellent symmetry. While the highest HRD cut grade is a very good polish and very good symmetry. It is obvious to see that you can't easily compare diamonds with different certificates. The same diamond with three certificates can be a Excellent/Excellent GIA, Very good/Very good HRD and Ideal cut AGS. This can be very confusing. Its always a good idea to consult a diamond broker or diamond wholesaler when evaluating a diamond cut.