Hi,
I've been researching the Julers for a while, as my 2xggf was adopted into the Juler family.
I've written a lot of what I've discovered into WikiTree here.
This is the bio of William Fox Juler, chemist and druggist of Norwich
https://www.wikitree.com/index.php?title=Juler-31- his forbears go back to John Juler, famous watch and clockmaker of North Walsham, Norfolk,
https://www.wikitree.com/wiki/Juler-9and his ancestors, who, the story goes, were French Huguenot jewellers who fled persecution in about 1680, in the reign of Louis XIV. That would certainly fit the name; 'le joaillier' being French for 'jeweler'.
I don't know if any of these bios are relevant to you, but you might find a few details which would be useful.
I haven't yet managed to get any further than Matthew Juler, John's father. That said, I haven't visited Matthew for about three years (too many other rabbit holes) and by now I might know enough to be able to do better research.
Feel free to contact me, if you'd like to.