Deciding between Diamonds

[Timlimster]

Dear All,

I'm deciding between these 2 diamonds and I've read about how good WHITEFLASH really is. They recommended these 2 for my budget of 4000. What does the community think? It's for an engagement ring. They recommended the 0.86 carat. But the 0.755 seems like a very good deal too.

And would you set it in a tiffany 4 or 6 prong ring?

http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-2228599.htm

http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3256261.htm

Thanks

Timothy