Jeweler in go 50

Suggestions
1

Imported from legacy Flarum.
Original author: guezel (Flarum #189)

Please put an NPC Jeweler at go 50, as sometimes the grade change likes to fail a lot and moving to another city to buy gems and coming back to try again gets annoying.

2

Imported from legacy Flarum.
Original author: crybabyhunter (Flarum #527)

Now, this is a suggestion I can get behind with.