shape
carat
color
clarity

Any Reason not to?

Nope. Except you are overpaying. If I was spending 20K I'd want at least 1.70 carats.

I wouldn't spend money on F VS1 though. I'd drop to G VS2 save the money. You won't be able to tell them apart. They could sidestones to the same stone or earrings. Or better yet, H eyeclean SI1.
 
I'd be buying one of these:

http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3048659.htm
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3016703.htm

Or I'd call a vendor and ask them to get you a 1.7 G VS2 (I couldn't find any in stock)

You can ask for the actual images of this diamond (those are all sample images): http://www.engagementringsdirect.com/1.64-carat-g-vs1-hearts-and-arrows-round-cut-diamond-gid-108321.html At least it gets you over 7.5 mm and yours is only 7.26*7.37
 
No you're not missing anything but the price is really high.
 
GET 3 FREE HCA RESULTS JOIN THE FORUM. ASK FOR HELP
Top