Total Depth Percentage

Once you know the Average Girdle Diameter and the Depth, the next step in order to get the Total Depth Percentage would be as follow:
Depth divided by the Average Girdle Diameter X 100 = Total Depth Percentage.
For Example:
Depth = 3.50
Average Girdle Diameter = 6.20
(3.50 / 6.20) X 100 = Total Depth Percentage.
(0.564) X 100 = Total Depth Percentage.
56.45%  = Total Depth Percentage.
For Jewelry the ideal Total Depth Percentage is somewhere between 55% - 65%.
However when it comes to investment the ideal Total Depth Percentage would be 58% - 62%.
It is important to add the even if the Diamond is within the safe Total Depth Percentage there is no guarantee that its a excellent cut, there are many other factors involve, and it only takes one to jeopardize the investment.