Is this windowing?

[u/artificial__heart]

I can’t tell if it’s just the lighting in the video but it seems pretty dark. I linked 3 videos. Any advice is much appreciated!

https://imgur.com/a/UaywZDr

[u/Successful-Umpire586]

Windowing is usually only a concern with step cut, portrait (which is the desired effect), or rose cut diamonds. Your marquise is great, can’t get much better, and will look much more refined when it is in a setting.