Not to be a pain, but, I have some issues with the stone size chart.
This is the biggest:
Note that the weight for a 10x12 oval is estimated to be 5 carats. This is approximately correct and consistent with other figures I have seen. However, the 10x12 emerald cut and 10x12 radiant cuts are also quoted as 5 carats. This is does not make sense. Observe that if you take the oval face up and the rectangular cuts face up [all three depth tolerances are within the same range], the oval would sit entirely within the rectangles. So there would be extra stone sticking out on the sides for the rectangular cuts. Hence, the rectangular cuts of the same dimensions would be expected to weigh more than the oval. This conclusion is consistent both with my own experience [my 9.9x11.8x6.5 EC weighs 6.39 carats - a 10x12x6.5 EC is in the 1A [top] cut category] and with the calculator, below. The issue is carried through all the weights for these shapes.
The 5 carat weight for a 11x11 trillion is also suspect. I believe it is overstated. Ditto for the heart of the same dimensions [albeit to a lesser degree]. [I am too lazy to do the volume calculations for well cut stones of these shapes at the moment - I'm still sick].
Just my .02 [I hope my explanation was sufficiently transparent to be understandable!]
Also, here is a diamond weight calculator you can check for consistency or just to estimate weight as it was intended:
To get depth ranges for the various shapes [if you don't have them] go to http://www.gemappraisers.com/
and click on "old DIY cut grading" link on the left. Type in the shape and it will give you acceptable ranges for the various measurements for the qulaity cut you are interested in.
Hope this helps.