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1) Have you upgraded all three mission portals to level 3? This is the only task I can remember that needs lots of gems *and* it can not be done with other means.
2) If you want the Golden Egg achievement for your collection, you need to intercept events for gems. Also, the higher level of Money Is Everything is hardly possible to collect without unlocking Golden Dome events.
3) You may assign a different bot for an event that you can’t complete with a given one.
As for the rest, it’s up to you. Spending gems on accessories seems a waste to me, unless they will make them affect combat stats someday, but there’s no signs of that so far. When there were gem-efficient Pig Lab recipes, I used to spend gems to speed up 11-15 level upgrades, but now gems are rarity again, so… well, just keep hoarding, I guess.