One of the rarest cuts of all, the Ideal Cut diamond is a cut designed to reflect almost all the light that enters it, making Ideal Cut diamonds some of the brightest possible. This cut is a refined Brilliant or Princess Cut, ensuring ideal proportions for the crown, table, diameter and pavilion, along with the angles for all facets. It is also given the highest standards of polish and symmetry possible.

With all that, the Ideal Cut is used as a benchmark for grading all other diamonds, although the exact proportions that make an Ideal Cut varies from region to region, depending on the company doing the grading. In America, the standards are usually determined by the American Gem Society Laboratory (AGSL), but this varies in other countries.

The idea of an Ideal Cut came from Marcel Tolkowsky, a Belgian diamond cutter in the 1900’s, and he created the name after analyzing the Round Brilliant Cut diamond. To calculate the Ideal Cut, he considered two aspects, Brilliance (How much white light is reflected from the diamond) and Fire (The effect of the light being dispersed into rainbow colors), and those calculations still serve as a guide today, although variations have been made over the years from country to country and lab to lab.

The Ideal Cut Tolkowsky created was not perfect, and today, we also use the guidelines created by another diamond cutter, Bruce Harding, in the 1970’s, and several computer models that have been developed since, to allow us to be even more precise with what the Ideal Cut is.

There are at least six different Ideal Cuts being used today, but only three are commonly found, including the Tolkowsky original. Ideal Cuts are perfectly proportioned to maximise the light reflected through the table and crown, creating the highest levels of brilliance and Fire possible, and here at Heiress we are able to provide exquisite examples of Ideal Cut Diamonds for our discerning customers.