Hello PS. I just discovered PS yesterday and pretty much spent all night researching all your valuable forum topics and expertise. Wow - I can't believe how little I knew about diamonds. My end goal is to get my gf the princess cut of her dreams, but I can see how easy it is to possibly make a mistake if I'm not careful. I guess my question is, which please forgive the ignorance, but how can I truly ensure my princess cut sparkles like a star. It seems as though there are so many specs to consider besides just buying a diamond that is Ideal Cut. Is a table % in the 60s truly important. What do the experts think about Table% and Depth% in relation to the overall sparkle of the diamond. I wish I could just plug these numbers in someplace like the HCA tool but I know that is just for Round Brilliants. I feel like Whiteflash does not have many ACA diamonds that are exactly what I am looking for. Can I go wrong with BN Signature? I feel, with my limited knowledge, I can't just go by GIA excellent cut, because I have seen some forums conclude this is not enough. Any, any, any advice would be so appreciated!
I wouldn't recommend Blue Nile for any fancy cuts, because you can't get images of the stones, and the faceting on fancies like princesses can be so different--one might appeal to your eye, another might not. I would also not go with GIA excellent cut, but would try to find an AGS 000 stone, if possible, or at least a vendor with images like Whiteflash, Good Old Gold, James Allen, or Brian Gavin Diamonds. 
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