The Make :
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
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%
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.
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