Dolphin

I haven't been anywhere today to take a blip ............... so you are getting the latest addition to my collection of necklace pictures which I put into small frames and hang on the wall.

It is one of the pieces made by our tame jeweler in Pittenweem.
The dolphin and wave are silver - the background is niobium.

I also bought THESE.
They are about 2.5in long.
Any ideas what they can be used for?
(I just liked them)