Back from Tiffany''s...and the band was gorgeous! They said their band was a little under 4mm, and it was a bit on the wider side of my preference. This makes me think the 3mm will be perfect. But the band complemented my ring very nicely. I didn''t mind the gap (hehe) as much as I thought I would, so getting it done the regular way is definitely an option.
I am having trouble attaching photos but I found this link with the setting from JA.
https://www.pricescope.com/community/threads/i-love-my-new-radiant-engagement-ring.29538/
Are you going to go with a 3mm scattered band jfirestarb?