This is so fascinating: I had never seen it before this morning!
I think it will not be easy to solve this one, so I promise to buy a card from the winner’s portfolio!
Guesses so far, but none of them is a clue:
2 amber or natural resin
3 caramelised sugar or toffee
4 bladder stone
5 lump of dried varnish
6 something molten and dropped into water
7 chipped Thunder Egg
8 melted candle wax
It WAS edible, but is no longer now
Regarding the size: It would fit into an egg shell
9 playing with gelatine, formed and dried
SOLVED by Soxy Fleming, when she saw the complementary photo: it is an old egg yolk dried inside an easter egg!