Welcome welcome @saber1995 to the forum! It is a lovely place where you can share all kinds of stuff (appropriate of course), share bugs, and even get assistance for code! We suggest that you review this topic which shows all essentials of this board! And we suggest you review this topic which shows how to post your code correctly! Thanks!! 
You do not lose your gems from your purchases, but you do lose all progress (levels, heroes, gems from levels.)
We already have a topic for questions regarding resetting account.
It is here : Should i restart?[SOLVED]
If you have further questions, please post them in the topic above.
Thanks! Lydia
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