Dave, A Beader can show you. It is a more professional way of
finishing the connection between the last bead and the clasp.
Essentially, it is a very fine coil of either silver or gold wire. A
small piece of it is cut off and strung on the cord, silk, linen,
whatever next to the clasp. It forms a circle over the base of the
clasp giving the connection a much finer look than the plain cord or
bead cup link between the clasp and bead.
Takes a bit of finesse to get used to using it. I quite understand
the desire to find this in fine silver or gold. Base metal is not
appealing. I have long wished for the same.