(For all th's):-Never ever use gems unnecessarily. In the beginning,you'll have 250 gems. Save them very carefully. Along with your development think about getting 450 gems by reaching 1250 trophies. Once you get 700 (450+250) gems. Buy your 3rd builders hut (500 gems).After getting it your next aim should be to reach Crystal so that you get 1000 gems (via achievement).Then you should buy your 4th builders hut (1000 gems).It is very good to have 4 builder huts in a base as it will help in speeding up your development.
II Method (Troll method)
Just buy some gems from the shop and buy all the builder huts like a boss..
P.S:- Hello addicts!My base is the cover for this story..Any queries???
Just ask me via private Chat.