I am one of the priveleged tatters that owns a Jan Stawasz book.  Hoorah!!
This necklace was taken from his book 'Tatting theory and patterns'
I wasn't sure which length to make the necklace, so I used a clasp on both ends.  That way I can just clip it onto whichever loop was the most appropriate for the outfit that I wear on any given day.
I haven't done much bead work before.  It is a bit more fiddly than normal tatting, but seems to add a nice touch.