You get the gems the same way you get ruby/emerald/sapphire/diamond stones required for the armors. At the best locations in the mines you can 5 stones but you can also get you get about 1000 gems instead. To enforce getting more gems you can reload everytime you get 1 or 5 stones until you get enough gems instead.
It's troublesome having to buff up your party, but you only have to do it once a day. If you choose the buffing order (I'd start at 5 am at the shrine in the desert which grants +15 levels) and use spells like Teleport and Lloyd's beacon wisely you'll have more than 20 hours totally buffed up to explore the pyramids.
That's a lot considering that an indoor action takes only 1 minute.
(Don't push space for drinking from a well, else time will pass.)
If you get low on HP/SP just set a beacon, use the other beacon to refresh at a well which grants extra HP or SP and use a beacon spell back in.
You don't have to reach level 250 right now, you'll have to do a lot of other quests in WoX which will grant a lot of gold and XP.
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