I sliced a memory foam pillow to half thickness with a single edge razor and put it in the same case as a firm pillow. It’s stiff as fuck for the first week or 2, but hoo boy is it the best pillow I’ve ever had. My wife kept stealing my pillow, so she got the other half of the foam pillow

I use kijiji, even with the dwindled userbase compared to marketplace, signal instead of messenger, and I wasn’t going to events anyway, so I’m set without facebook

I would refer to that as thickness, but I’m not a jeweller. My advice stays the same though, try some on and see what you like.

My wedding band is ~8 mm and i’ve never worn a ring less than 4 at its narrowest point. I would say just find something you like the look of, and see if you can find something at a jeweller that’s similar you can try on if you’re that worried about the fit.