I don't think jewelry is mandatory, but I admit a totally accessory-less outfit would leave me cold. Jewelry is just one kind of accessory though. Belts, scarves, hair accessories, shoes, legwear, specs, hats, and even a hair style can instantly enrich a look. Jewelry is easy and familiar which is why I think it makes a popular choice.
Mac, I don't think we have seen any of your outfits but I am left with the impression that you have a quiet, restrained, minimalist style. Is that accurate? I think that is still a worthy statement to make with your appearance.