CVD diamond brightness question.

[NewbieNewGuy]

I have been looking at some diamond 360s recently and noticed this one CVD diamond that looks decent but I am no expert of course. The specs seem quite good on paper but one thing that seems to be strange to me is that it just doesnt seem to be as "bright". I am not sure if that is the right terminology but it in laymen terms it doesnt seem to glow and sparkle as the others do. I am not sure of the color as well. It seems quite clear and colorless especially compared to the brown CVDs I have seen in the past.

This is the CVD diamond in question:

https://www.jamesallen.com/loose-diamonds/round-cut/1.22-carat-d-color-vs1-clarity-ideal-cut-sku-22033382

Loupe360

loupe360.com

Here is a brownish but BRIGHT CVD in similar specs:

Lab-Created 2.01 Carat round diamond

This 2.01 carat Lab-Created round diamond G color vs1 clarity has Ideal proportions and a diamond grading report from IGI

www.jamesallen.com

Here is an HPHT that is bright with maybe slight blue tinge?:

https://www.jamesallen.com/loose-diamonds/round-cut/1.20-carat-d-color-vs1-clarity-ideal-cut-sku-19579888

The HPHT appears to be far brighter from all angles. Could someone explain is that first CVD nice still? Is lighting possibly at play here? Any advice is welcome of course as well.

Thank you, a fellow rock enjoyer.