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Use the search function. I entered Gem and the first one is exactly like the problem you described.
In short: Contact Nick via a PM.
Here is the link to it:
http://discourse.codecombat.com/t/help-i-have-3655-gems-now-i-cant-continue-the-game-until-i-get-100-gems-to-buy-a-glass-what-should-i-do/2892?u=j_f_b_m