@gabriel-marques-santos What are you asking for?

You can get free gems sometimes as daily gifts.
You can get 10 to 15 free gems on the 'freebies island' if you watch enough advertisements.
You can also get 1 gem everyday with Jewelem Tower on second island.

Por vezes é possível receber gem grátis como presentes diários.
Pode receber de 10 a 15 pedras gems na "freebies island", se assistir a anúncios suficientes.
Também pode receber 1 gem por dia com a Jewelem Tower na segunda ilha.

There are many ways to earn free gems, such as using the Jewellem tower. Finishing the league levels. During events. Watching ads on the tv. In alliance chests. Completing tasks or surveys on the tv.