Agreed - very pretty stopper, but it doesn't look like Bocote to me. More like Cocobolo or "Rosewood" (yes, I know Bocote is a rosewood too). BTW, nice pic of your arm! []
I think that you all are right about it not being bocote. I had a piece of bocote out before I turned this. I believe, though I could be mistaken, that it is a piece of asian rosewood.