Gia Diamond Table

Estimating a cut grade using the gia diamond cut grading system explains the system gives definitions and displays the proportions listed on a gia diamond grading report. The crown facets consisting of 8 bezels 8 stars and 16 upper halves gather and disperse light to create brightness fire and a scintillating pattern of light and dark. For a princess cut diamond an ideal table takes up 68 to 74 percent of the width of the diamond see this example of a stunning 0 90 carat ideal cut princess diamond with a table of 71.

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A larger table percentage does not necessarily equal a more brilliant diamond as there are multiple factors which dictate the final fire and brilliance of a diamond.

Gia diamond table.

For the g colored diamond we see alot more areas of black which relates to more contrast in the diamond. This phenomenon occurs when the diamond has a depth that is less than the table. The table facet usually the largest facet on the diamond helps gather light from above and either reflects it back to the observer or directs it into the diamond s interior. The bezel facets of a diamond are where we observe the most fire.

It shows twenty five example images of round brilliants five in each of the five grade categories and gives their proportion combination values for additional. The gemological institute of america gia grants you a one time non exclusive license to reproduce in print form this booklet solely for non commercial private use to reference the gia diamond cut grading system within an individual organization. A very good cut can be between 56 to 67 percent or 75 to 76 percent. An overly large table limits space at the crown area meaning the upper girdle and bezel facets have less surface area.

In this particular diamond the depth is 58 4 and the table is 61 0.

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