After gemology, the logical following thing would be potionology.
Based on the same system, size and quality. (tiny-jotun / rough-brillant) but with other names fitting for potions.
They would give some small temporary buffs "like +2 STR for 5 minutes"
You would need for example spring water and different herbs (ones that preferably can't be gardened, so people would forage more)
Size would determine how potent is the buff and quality how long the buff lasts.
That's just an idea.
Tell me what you think
