The Make : Depth % Depth percentage is the ratio of the total depth of the diamond (from table to culet) as compared with the total diameter (which is used as the 100% figure for all diamond dimensions). For instance, if the total diameter of a round diamond is 6.00 mm and the total depth is 4.00 mm, then the depth percentage is 66.7%. The ranges that are commonly considered best for each shape vary slightly, but we will just give the basic dimensions for rounds here. Dimensions for other shapes are beyond the scope of this brief report. However, for the most part, fancies also follow the same guidelines given below. The exceptions to this rule are princess, radiant and emerald cuts, for which you should allow up to 70 - 75% for acceptable ranges (in our opinion). Ideal = 58 - 60% Excellent = 60.1 - 62% Good = 62 - 64% Fair = 64 - 66% Poor = over 66% or under 57%   Please Note: Discounts for stones outside of these limits are too difficult to explain here. If you want to learn how to calculate a price for any diamond you want, please see my easy, fast, step-by-step Diamond Pricing Tutorial page. Back to: How to Read a Certificate