I need help....Please!!

Of course I don't mind, always pleased to help explain!

I chose the first two diamonds because of the proportions.  The last one could still be a very nice stone, but the pavilion angle is on the shallow side - the pav angle is a crucial engine which helps to drive light return.  Generally a pav angle of around 40.6 to 41 degrees is preferred here.  And in all cases but especially with diamonds that have proportions hovering in You have obviously been doing some homework due to the diamonds you have picked!!!  Maybe this might help, here is a these ranges, an Idealscope image is very useful as is the eye and advice of a trusted vendor ( of which Jim Schultz at JA is one!!)

The first diamond has the coveted AGS0 cut grade, so that should be a great looking stone.  The second has good numbers, but an Idealscope image would be useful to check this diamond out, so ask JA for one, which they should be able to supply no problem as the angles are on the steeper ends - it could well be perfectly fine but an IS is good to have.  It appears to be facing up a little small for its weight, but it is still a nicely cut stone.

range of ' safe' numbers some of us use to determine well cut round stones.  It is important to remember that it is how the angles work and balance each other which is what will light up a diamond, so sometimes angles outside of these ranges can be a great fit for each other, then the Holloway Cut Advisor  is useful to let you know which ones are worth further evaluation.

depth - 60 - 62% - although my personal preference is to allow up to 62.4%
table - 54- 57%
crown angle - 34- 35 degrees
pavilion angle - 40.6- 41 degrees
girdle - avoid extremes, look for thin to slightly thick, thin to medium etc
polish and symmetry - very good and above

note - with crown and pavilion angles at the shallower ends ( CA 34- PA 40.6) and steeper ( CA 35- PA 41) check to make sure these angles complement in that particular diamond - eyeballs, Idealscope, trusted vendor input - check as appropriate!


Advice from one of the experts.
With that said, here's a "Cliff's Notes" for staying near Tolkowsky/ideal angles with GIA reports (their numbers are rounded):  A crown angle of 34.0, 34.5 or 35.0 is usually safe with a 40.8 pavilion angle.  If pavilion angle = 40.6 lean toward a 34.5-35.0 crown.  If pavilion angle = 41 lean toward a 34.0-34.5 crown.

GIA "EX" in cut is great at its heart, but it ranges a bit wider than some people prefer, particularly in deep combinations (pavilion > 41 with crown > 35).

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