What Should First-Time Ring Buyers Know About Toi et Moi?

I'm shopping for an engagement ring for the first time and recently discovered toi et moi engagement rings. I really like the meaning behind the two stones, but I'm not sure what to look for before buying.

I'm trying to compare stone shapes, settings, and metal options to find something that will last for years. I also came across this collection and found some beautiful designs:
https://www.antiquecut.com/col....lections/toi-et-moi-

If you've purchased a toi et moi ring before, what advice would you give to a first-time buyer? I'd appreciate any tips that helped you make the right choice.