Daily missions = 50 jewel /day
Log in bonus = depend on the regular / event bonus, but even the normal one is about 100 jewel a week
1st time = 50 jewel the 1st time you finish a quest
Hime / eidolon = 50 for the encounter (I got her) episode, 50 jewel for every H episode other than the 1st of a hime (when you get a new ability)
GO = well, it's quite hard (for low lv player unless you bought charac with $$), you can earn quite a bit
Event = advent battle / raid battle / Union event. They gave quite a lot (a big lot if your union got a high ranking), but the event are usually time consuming (grind grind). Buying all the advent event jewel yield 3k... but take some grinding time
And last... well, your real life wallet to buy in game money to use for storage increase / potions / gatcha..... (not the best option unless you really mean it)