Eh... maybe given a couple of centuries. I don't really see them using anything fancier/blingier than a signet ring which doubles as a seal. Their practicality comes out of necessity, not simple desire for it, and I think it would be a while before they start devoting time/energy into specific marks of office that are that much of a waste of resources in terms of material wealth. I never get the sense that the nobility is particularly wealthy at this point.