Try a small map like the rooms on floor 3 of phantom school (unless the drillable items have changed there...?) - I think that's where I got a lot of my sapphires way back when...
I'd just give you some if my graphics card weren't owning the hell out of my computer. 8D But I don't think drilling four sapphires will take long in those rooms anyway. Good luck!
Temp inactive again...
GigaBowser, 4411 HP melee dark/fire/lightning wizard, 193/204
Deudalephon, 4411 3:1::LK:WT melee water/lightning soul master, 150/165
Hemathion, 4411 3:5:4::WT:HP:MA melee dark lord, 140/140
Anchors, 1414 MA priest, 244/250
Vadise, 1414 MA wind/earth soul master, 210/216
IreneAdler, 1414 MA fire/lightning soul master, 154/152
So, like, let's go look for the road and talk about our hair!