Help choosing diamond for engagement ring

[Fonzie]

Hi everyone.

I'm looking around for an engagement ring and am thinking about buying online.

I've been searching around and doing as much research as possible.
Just want to find out what people's perceptions of this diamond are:
http://www.jamesallen.com/loose-diamonds/round-cut/1.01-carat-h-color-vs1-clarity-excellent-cut-sku-213747

It's a hearts and arrows brilliant round cut diamond and I think it looks pretty good. Just trying to get another opinion.
pricewise i'm having a hard time comparing.
Also anything I have missed?

Also how about this one? another very similar stone from a different vendor:
http://www.goodoldgold.com/diamond/12109/
I'm pretty sure they aren't the same :p

or this one from whiteflash:
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3043084.htm

These are all similar specs, super ideal cut but different price.

 

[heididdl]

I always feel more secure with AGS O so number 2. Good old Gold and Jonathan. Call them

 

[Fonzie]

Thanks for that heidi. How do i figure out what the HCA rating for these stones are? I saw another post where someone mentioned that the stones had a HCA rating of <2 but i can't seem to find anything on the certificates or anything like that which shows me this. Is this something that I need to ask the vendors directly?

 

[Fonzie]

Hi guys.
Looking to pull the trigger on one of these stones soon. I've managed to figure out how to do the HCA rating and these three stones are all very similar and < 2 (all around the 0.9-1.1 range).

Is there anything else that I may have missed or with all three of these stones i'm pretty much okay? Just need a bit of objective support!!

Thanks!