Ideal Round Brilliant Cut Diamond Proportions

You might have heard about the fact that the exact diamond proportions determine the cut of a diamond.

Ideal round brilliant cut diamond proportions.

A specific set of terms is used to describe parts of a polished diamond. Like with the ideal diamond table percentages we listed above these ranges are intended as general guidelines only. Unlike the round brilliant diamond the gia report does not list a cut grade for a radiant cut diamond. Each part of a diamond makes its own contribution to the diamond s appearance.

To determine the cut grade of the standard round brilliant diamond the shape that dominates the majority of diamond jewelry gia calculates the proportions of those facets that influence the diamond s face up appearance. Ideal cut diamond proportions and brilliance. The ideal cut round brilliant diamond describes a round brilliant diamond that has been cut to exact and mathematically proven proportions. This graphic illustrates the measured and visually assessed proportions that affect a round brilliant diamond s cut grade.

It will therefore exhibit a lot of sparkle brilliance and scintillation. When a stone is cut to ideal cut diamond proportions light entering from any direction is fully reflected through the top of the diamond and dispersed into a. This is exactly what you are looking for in a beautiful diamond. And of all the diamond 4cs it is the most complex and technically difficult to analyze.

If a diamond is cut too shallow or too deep light is lost out the sides and doesn t reflect as well back to the eye. Ideal proportions for a round brilliant cut diamond marcel tolkowsky revolutionized the world of round brilliant diamonds in 1919 when he published his landmark book titled diamond design. 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. This is because radiant diamonds have many non standardized facet structures and there can be a wide range of proportions they can be cut to.

In the first section we will provide our best summarized insights on ideal proportions for round and non round fancy shape diamonds. Please note that gia does not assign a cut grade to fancy cut stones such as princess cut or cushion cut yet but still these proportions are critically important in analyzing the cut. This article has two sections. With ideal diamond proportions a diamond takes in and reflects light well causing brilliance and fire.

For a princess cut diamond choose a diamond with an ideal depth of 68 to 75. The proportions of a diamond refer to the relationships between table size crown angle and pavilion depth. The large flat facet on the top is the table. If you have a stone with perfect diamond proportions the diamond will refract the light in an excellent way.

Recommended proportions for radiant cut diamonds. Its symmetry with 58 precisely placed facets produces the ultimate in luster and beauty. This 1 26 carat round cut diamond is a stunning example of a diamond with ideal cut proportions. In the standard round brilliant there are 57 or 58 facets.