Help a NOOB: this looks too good to be true

Hi Guys,

I'm a grad student who is looking to pop the question soon and since finding PriceScope, I've been devouring as many posts as I can! I do genuinely want to say THANK YOU to everyone here... tons of practical information and helpful people who take the time to help others out.

Now, on to the nitty gritty: I have been looking for a ~1.5ct princess shape ring with a reasonable color and clarity and of course EXCELLENT cut. Now I found this on WF and for the price, it looks like a steal!!

Carat: 1.44 
Color: J 
Clarity: VS2 
Cut: Very Good
Shape: Princess 
Depth %: 73.2 
Table %: 70.0 
Polish: Excellent 
Symmetry: Very Good 
Fluorescence: None
Measurements: 6.30*6.24*4.51
Length To Width Ratio: 1.00 
Lab: GIA
WF: 4/5 stars rating
Price: $4,970

Now, I know a lot of people would recommend a better color but here's the TWIST: I actually have seen this loose diamond in harsh white light next to a G and it still looks great (I guess I'm not that color sensitive)!

Okay, now to explain: You see, I live in NYC and my friend recommended a private dealer who works in the infamous Diamond District but not in a B&M - he is from a family diamond wholesale business who sells to regular customers based on personal referrals. He pulled this diamond for me and offered to sell it to me for $5,620. Initially, I felt that for the size and quality, it was great but something seemed familiar. Then I got home and found the EXACT same diamond (down to every spec and 1/100's of a millimeter) on WF. Sadly, the link is now gone since WF can't list it if this dealer has pulled it out of the shared national inventory that a lot of these guys all share (this was according to the nice lady at WF that I spoke to).

Soooo... my question is besides confronting the dealer on the mark-up (he claimed he was giving to me 'at cost'), do you think this 1.44 princess is worth getting?

I know everyone here loves ACA Princess but honestly, I'm looking to spend $6k plus probably another $2k for setting and matching band for a total budget of $8k. My fiancee wears a 6.5 size ring and although I know she would love any size ring that I get, I also know her personal preferences and this poor Grad student is trying his best to meet them without sacrificing too much quality.

Thanks for reading through this....

Ice Noob