It is cobalt.
The body contains amber swirls which make it appear more purple. The zigzags are cobalt in clear and they're beautifully chunky and rounded, not flattened.
(Cobalt on its own is incredibly dense, no light gets through it, whatsoever.)
This zig-zag is 12cm in height and 12cm in diameter.
It's kind of cauldron shaped, with a lovely rounded belly.
There are even sharp little bits of frit inside - they're there to add the special Harris magic to the spells I'm going to be mixing in it.
I still can't get photos from the camera into this nasty new pc.