What are the Table Width and Total Depth of a diamond?

The depth of a diamond is measured from the table to the culet. It is expressed as a percentage of the diamond’s diameter at the girdle.
The table of a diamond is expressed as a percentage of the diamond’s narrow-girdle diameter. On a round brilliant diamond, it is measured from corner to opposite corner, rather than from flat side to flat side.
For a round brilliant diamond the following ranges could be expected:

Excellent Cut:
Table: 52.4% - 57.5%
Depth: 59.0% - 61.0%

Very Good Cut:
Table: 57.6% - 59.5%
Depth: 58.5% - 58.9% or 61.1% - 62.5%

Good Cut:
Table: 59.6% - 62.5%
Depth: 58.0% - 58.4% or 62.6% - 63.0%

Fair / Poor Cut: not in the ranges defined above

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The Table Width of a diamond is often expressed in percentages, which describe the ratio between the width of the table and the width of the diamond (Girdle diameter). Total Depth percentage is the depth of the diamond (from the pavilion up to the table) divided by the width of the diamond. The bigger the number - the deeper the diamond.

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Table percentage, or Table Width is the percentage of the table width (table diameter) of the total diamond width (the average diameter of the girdle). A table width of 61% is considered as ideal by most diamond grading institutes. Large tables allow a good spread of light and usually make a diamond seem bright. On the other hand, "fire" is lost if the diamond's table is too big.

Total depth, or diamond depth percentage is the ratio between the diamond depth (the distance between the table and the culet) and the total diamond width. Unlike Table Width, Total Depth comprise of other parameters of a diamond cut, including crown angle, pavilion angle, girdle thickness, pavilion depth percentage, which total depth depends upon (or the other way around).

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