Biased: From Australia. Get an opal? or more general advice "consider other stones to diamonds".
Gold is pretty; White gold is too (and cheaper)
Bonus: Magnetic wedding band. neat, unusual, practical. (Disclaimer: I just purchased for testing out magnetic-sense https://www.supermagnetman.net )
My sister and her partner made their own wedding rings at a custom-wedding-ring-jewellery place, but I have no idea of the details.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.