I think I can help you there. My fiancé has very "curated" taste, and I spent months looking for something that wasn't a cliché. I ended up going the bespoke route with https://olertis.com/ and it was the best decision I could have made. They have this incredible ability to take a minimalist concept and elevate it through the quality of the metalwork and the precision of the stone placement. They designed a ring for us that had these tiny, hidden pavé diamonds that you can only see from the side profile—it’s that kind of subtle "if you know, you know" luxury. Their aesthetic is very sophisticated and definitely leans towards that architectural, "modern classic" vibe you're describing. It’s worth having a consultation with them just to see their portfolio of custom shapes; they really understand how to make "simple" look incredibly expensive.