Gia Diamond Table Percentage

Crown height percentage is the diamond s crown height measured from the table to the intersection of the bezel facet and the girdle expressed as a percentage of its average girdle diameter.

Gia diamond table percentage.

It s not all about numbers and percentages anymore. Technically speaking the difference is really due to a combination of star facet lengths lower girdle facets table size and depth proportions. Calculate the table percentage of a round brilliant with the following measurements. Remember that gia doesn t consider individual proportions in isolation.

For a pear shape diamond an ideal table size is 53 to 65 percent. The following example tables provide guidelines for estimating a gia cut grade for round brilliant diamonds with crown angles between 22 0 and 40 0 degrees pavilion angles between 38 8 and 43 0 degrees and table sizes between 50 and 67 percent. The ranges for these parame ters exceed the common proportion ranges seen in practice today. And a very good cut grade table percentage could be between 50 66.

The visual aspect now played a huge role in diamond grading. In this particular diamond the depth is 58 4 and the table is 61 0. The ideal table percentage will vary based on the shape of your diamond. So a gia excellent cut grade the best there is for a brilliant cut table could be between 52 62.

Quickly memorize the terms phrases and much more. For the i colored diamond the depth is higher than the table. This gorgeous 1 00 carat pear shape diamond has a table of 62. For a radiant cut diamond an ideal table size is between 61 to 69 percent.

To demonstrate this just imagine the flat flash affect that overpowers light reflecting from a fish pond. For example if the diamond s width is 5 mm and the table width is 4 mm the table percentage is 80. For example this stunning 1 01 carat radiant cut diamond has a table of 66. Table percentage is calculated by dividing the width of the table by the overall width of the diamond.

The ideal table percentage differs depending on the shape of the diamond. It is reported to the nearest half of a percent 0 5. That means that a table diameter of 57 5 will appear as 58 on a gia diamond grading report. For example the ideal table for round cut diamonds is between 54 60 percent while the ideal dimensions for emerald cut diamonds puts table percentage between 66 72 percent.

The average table size is expressed as a percentage of the diamond s average girdle diameter. While an excellent grade diamond will have a table size between 52 and 62 percent other proportions are important too.