I never really missed it, but it makes sense that we should have belly piercings just like we got facial stuff. Maybe it's a technical thing as there are no "slots" for jewelry on the sim's body, just hands and head.
I think the stuff pack should also have brooches, kinda old and traditional but would suit especially elder and richer ladies well. Wile at it, why not create a metal medal hanging from (necklace) ribbon to be used for story telling etc. I would not mind some clipping with the "wrong" outfits. Same for your belly piercing, might conflict with some clothing options but I could live with that, too :)
Aaand - not exactly jewelry category - but how about buttons that are not stuck to just ne outfit, but that we can use whenever we want?