So if you were him which one will you take? He only wants D or E, VS1 and above, 0.75ct++, buget cap at $4500. Color and clarity are his personal preference.
1) 0.808 E VS1 Expert Selection from White Flash $4420.67
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-2262620.htm
2) 0.76 E VS1 Blue Nile Signature $4438 minus $100 discount from refer code so it is $4338
http://sg.bluenile.com/diamond-search?pt=sig&filter_id=0#diamonds_pid=LD01721399
Number 3 is a bit over budget:
3) 0.802 D VS1 ACA $4,790.85
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-2183244.htm
1) 0.808 E VS1 Expert Selection from White Flash $4420.67
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-2262620.htm
2) 0.76 E VS1 Blue Nile Signature $4438 minus $100 discount from refer code so it is $4338
http://sg.bluenile.com/diamond-search?pt=sig&filter_id=0#diamonds_pid=LD01721399
Number 3 is a bit over budget:
3) 0.802 D VS1 ACA $4,790.85
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-2183244.htm