found this app, ive used it for over 2 years, this is how i get my gems on growtopia! The app on google play is called: Mobile performance meter.
what is it? Your download the app, sign up with just your email, and you earn 10 points a day, and 100 points every pop up survey (every month just for surveys.) Their is a range of gifts cards! to walmart to online gift cards! 150 points= 1$ gift card (depends on the type of card) and 500=5$ and 1000=10$ and so on. Ive earned over 50$ over a couple years! heres some pics! Have fun!

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