Throne Rush Free gems It's relay Work

Collect three shards and receive your reward of 100 gems.

1. Invite your friends to play Throne Rush, once they have complete the “Sludgers’ Lot” mission they can send you one Crystal Shard.
2. A popular method of obtaining these shards, is by creating multiple Facebook accounts and then sending shards to yourself. Creating more than 1 Facebook account is against Facebook terms and I do not recommend doing it this way.
3. You can buy crystal shards for 25 Gems each. If you buy Crystal Shards you can still receive a profit of 50-75 gem

Moral Quest

100 Moral = 10 GemsEarn Gems by earning Moral. 

1. 500 Moral = 50 Gems
2. 1000 Moral =200 Gems 
3. 2000 Moral = 500 Gems

Install the Throne Rush apps on your mobile phone

If you download via your mobile and sync the application with your facebook account, you will have 50 free gems. Available only for the first installation.

Surveys

Complete Phone surveys to gain small amounts of Gems.

If you don't have a phone and you want to do these Surveys on the computer. Download Bluestack. BlueStack App Player is a versatile program that bridges the gap between mobile and desktop by allowing users to run their Android apps on their Windows or Mac OS X devices.