I saved all my gems, and got my 4th builder at TH 7.
Then I held off on using them for the 5th builder until after I hit TH 9, but I had enough at around 8 months.
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Save your gems from obstacles and complete achievements. Tons of people have gotten 5 builders that way without spending a penny
Save your gems from obstacles. Master league also gives you a lot of gems.
^ Do you even realize that:
1. This thread was created in May 2013
2. The last reply was in May 2015
3. We now have January 2016
4. The question was already answered multiple times in this thread
5. You have necro'd in a way that would even make the new lvl 3 Witch envious
?