Ring Drop
A simple metal ring connects these strands. Drop the bead through the ring for an easy front closure. No clasp to worry about. No tickling around the back of the neck, which often happens to me with a lobster clasp or a hook.
I love the look of a polished stone or glass bead dangling beneath an open ring. It reminds me to be open, to give simple ideas a spotlight and leave the complex formulas for physicists!