Can you adjust…

I have just discovered necklace extenders much to my delight and the new life it has applied to my necklaces. The current trend to wear necklaces at the eighteen inch or twenty inches has left a lot of my fifteen and sixteen inch necklaces sitting dormant in my jewelry cupboard sobbing their little hearts out. So I knew in theory what I needed, a necklace extender, but did such a thing exist or would I need to get one of those looped chains that hang down the back (not what I wanted). Google ...