I often get an amber necklace which has a clasp made from another amber bead with a tiny wood screw inside.The screw comes out to allow the necklace to be re threaded so it can get lost! Also some restringers can be over fond of superglue and will use it to glue up clasp so it cannot be used again.
I was delighted to find on ETSY a source of these clasps and I am sure I will soon be ordering some.The shop is called AMBER PARADISE.
