I have a bone belt buckle my father made for me back in 1981. I have been wearing it constantly since then. the scrimshow of the USS Constitution is wearing thin but the buckle is structurally sound after 20 years of abuse.

Now this is not quite the same as rhythm bones. this is from a leg bone and there is a wood core glued in where the marrow used to be. However, I have dropped that buckle on a variety of hard surfaces and it is still doing fine. Play d'em bones!