So here is my concept

I thought that it could be an interesting additional use for slime. It could take an incredibly long time, like many IRL days and it would be a gem that always crystallizes in a rough format and the size can depend on the a mount of liquid used. Like maybe a full bucket will eventually dry in to a tiny rough slime crystal and you've have to monitor the drying process and add more slime to the bucket before it finished to slowly build up the size.
could be some nice obscure crafting combo like dexy/lorey/psychey/willy type gem, but every time you cut it, you have a small chance of spawning a partially crystallized slime which is like a regular slime with big armour

BECAUSE FUN