Total Depth Percentage: A measure of the depth of a diamond from the table to the culet divided by the average diameter, (width), of the girdle. The depth percentage of most diamonds is between 53 and 63 percent.
TOTAL DEPTH PERCENTAGE
The Total Depth Percentage is the depth of a diamond, from the table to the culet, divided by the average diameter or width of the girdle. The depth of most diamonds is between 53 and 63 percent.
TOURBILLON ...
Loose Princess cut diamonds with larger total depth percentages is much smaller in length and width than lower depth stones.
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As you can see from the image a Good Table Percentage would be 52.4% - 57.5% (Ideal Standards). A Good Total Depth Percentage would be 58.7% - 62.3%. It all begins with the Girdle width and everything else just falls into place.
 See also: Diamond, Width, Depth, Proportion, Depth percentage
  
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