I wear this:
https://www.tiffany.com/jewelry/necklaces-pendants/paloma-picasso-olive-leaf-vine-pendant-31406439/
I recently broke (after 6+ years) when I snagged it while moving some furniture. I took it back to Tiffany's to have it repaired and they told me they will add or take away length on the chain for free! This also applies to new purchases; you can select something but specify the length and instead of walking out with it that day they will ship it to you. Great, little known perk.
I also wear a watch and 1.5 ct diamond studs. I dont wear a necklace with diamonds specifically bc I think my earrings are enough.
I am looking for a gold necklace but have been ho-hum about the options. I am not religious; I dont really like initial necklaces, thinking a gold Tiffany bean bc its a classic.