Hi everyone! Long time lurker... first time poster :) 

My partner and I are looking to purchase a loose lab grown diamond and plan to take it to a local jeweler to make and set my engagement ring. We love the radiant cut and tried on a 3.09ct with specs nearly identical to what's below/in screenshots. 

1. Is the extra cost for a GIA certified stone is worth it vs. an IGI certified stone? 

2. Why is it such a big price difference? 

I understand that GIA has been the gold standard for both natural and lab grown diamond grading to date. I also saw that new article about GIA no longer grading lab grown diamonds the same way.

We're very new to the lab grown diamond world, so any additional context on what we could be missing would be great! Let us know what you think!! Thanks all in advance! 

[Option 1 - 3.09ct](https://calaveranewyork.com/products/3-09ct-radiant-lab-grown-diamond-colour-f-clarity-vvs2-gia-certified-1?variant=48163659677933) \- GIA certified

* [Link to certificate](https://www.gia.edu/report-check?locale=en_US&reportno=1487196809)
* Colour: F
* Clarity: VVS2
* Measurements: 10.22x7.25x4.88mm
* L/W Ratio: 1.41
* Polish + Symmetry: Excellent
* $1,493 USD

[Option 2 - 3.09ct](https://calaveranewyork.com/pages/lab-diamonds?id=ec53e2e3-3c6d-4188-96ec-1b20ca8af627&stoneType=diamond) \- IGI certified

* [Link to certificate](https://www.igi.org/verify-your-report/?r=LG700501518)
* Colour: F
* Clarity: VVS2
* Measurements: 10.35x7.18x4.81mm
* L/W Ratio: 1.44
* Polish + Symmetry: Excellent
* $683 USD



Looking for advice on IGI vs GIA certification & which stone to choose. Options linked in post