Looks well proportioned, but one of the experts may have a better opinion on that than mine. Using the pricescope price stats feature:
http://www.pricescope.com/repscope.asp
It looks like you should be paying somewhere between $6643 and $6011 PER CARAT, depending on the cut. So for this stone that would be between $7108 and $6431. That first figure is the average pricescope price for an H&A and the second is for a AGA 1B cut. A 1A cut is somewhere in between!