So I have seen a ton of "hacks" and "free" ways to get green gems. Just jailbreak your device, or give me your password, and what not... but I haven't really trusted anything like that. Then I saw a video of a guy that does strategy videos for Clash of Clans, and he gave a legit way to get free gems. And it totally works! I bought my 3rd builder in about 2 days, and my 4th in another 3 days.
So here you go:
This is a guide on how to use the App "FeaturePoints" to get a free iTunes gift card, which you can redeem for gems in Clash of Clans. Make sure to use the referral code 'P9QNWD' to get 50 free credits/points.
1- Go to this URL on your phone: https://featurepoints.com/r/P9QNWD
2 - Hit 'Sign Up' and Install profile on your phone (this is how 'Feature Points' keeps track of what you have downloaded)
3- Use Referral Code 'P9QNWD' for an extra 50 points to start out with
4- Download free apps through Feature Points (you can install 'Feature Points' as an app for quick access from home screen)
5- Use each downloaded app for at least 30 seconds (once you have been given points for that app, you can delete them from your phone if you don't want to keep all of them)
6- Most important!! Refer your friends and have them use your unique referral code for more points. You get 50% of all your friends points.
Steps for getting free gems:
-Redeem an iTunes gift card (USA only) or PayPal gift card (int'l users) using credits
-Enter code or transfer PayPal money into iTunes account
-Purchase gems through Clash of Clans
-Upgrade more stuff
Side note: You can get PayPal gift cards, Amazon gift cards, paid apps and other rewards besides iTunes gift cards... For those that have 5 builders and plenty of gems already.