True, this happens. On the other hand, this is often the case for positions where you aren't allowed to wear jewellery or wouldn't want to wear jewellery anyway.

I.e. wearing a nose ring for a dev interview in a corporation with a strict dress code - likely a bad idea. But in a casual agency - you might get bonus points, if anything.

agreed. until you're the boss, and probably even then, it never hurts (economically speaking) to dress the part.