Switching out my center stone-is this the closest match?

[tmot14]

Hi everyone,
I posted here about my initial diamond search for an engagement ring upgrade([URL='https://www.pricescope.com/community/threads/newbie-help-me-pick-a-center-stone.205841/']https://www.pricescope.com/community/threads/newbie-help-me-pick-a-center-stone.205841/[/URL]), and with some help, I found this center stone:
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3164214.htm

I had it set in a gorgeous setting and it arrived earlier this week. Pics here:
[URL='https://www.pricescope.com/community/threads/tacori-engagement-ring-upgrade.206816/']https://www.pricescope.com/community/threads/tacori-engagement-ring-upgrade.206816/[/URL]

I think this ring is absolutely stunning. I can't stop gawking at it, and it brings me SO much joy to wear. However, I am not happy with how yellow the center stone appears and want to swap it out while I'm still within my return period. I am hoping for a center stone with these specifications:
Carat: at least 1.5
Color: G or higher (especially now that I know I'm quite color sensitive)
Clarity: eye-clean
Cut: ideal or excellent
Price: under $16k (firm)

I only found a few options. Brian Gavin had two, but he does not sell the Tacori setting and I'd rather not deal with the liability of having two separate vendors. Whiteflash only has one diamond in house that meets these specifications, and in many ways it's not quite as nice as my current stone. WF suggested this diamond (which I currently have on hold). It's smaller than I wanted, but is colorless and looks fantastic on paper.
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3186649.htm

I am worried about it appearing significantly smaller. Could someone more knowledgeable than me provide some guidance?
Original 1.513ct I color: 7.30 - 7.33 x 4.53 mm
New 1.354 F color: 7.17x7.21x4.33

I intend to wear this ring forever for sentimental reasons--no more upgrades in my future. My gut tells me this is as close to a "perfect" match as I am going to find in my budget, but I'd like some outside validation/opinions .

Thanks in advance for your help!

 

[diamondseeker2006]

I would wait and upgrade the stone when WF gets some G color stones in. G VS2 or SI1 is going to get you more size than an F VS1. Since you never plan on upgrading (and won't need to with your halo setting), I would want 7.3-7.4mm and 1.5 cts. As long as your upgrade costs more than the original, you can switch it out at any time.