Which job for gold box farming?

I've seen a SCH mass farm mobs in Abyssea with Kaustra. SCH would have an easy time building Azure and even Pearl (I've read that DoT kills from stuff like Kaustra give Pearl). But SCH isn't the easiest job to build Amber and Ruby. I suppose you could set up a melee atma set to build up to 40 or so Ruby and then switch to atmas so you can mass kill mobs with Kaustra. Red chests would eventually help build up the Amber that you need. You probably won't be in danger of timing out. But it could take a long time just to get up to sufficient amber.

I don't know how comparable the kill speed would be for DNC if you relied on Aeolian Edge. DNC would certainly make it easier to build Amber and some starting Ruby. But then you're relying on red chests to build Azure. You might be able to convince a soloing mage to team up early on to build lights for one another (help him build pearl while he helps you build azure).