You can get more Gems through the following ways: 

Referral rewards
You earn a significant amount of gems and gifts when referring friends to play Storm of Wars. Go to 'Menu' > 'Referral', scroll down and click the button 'How it works'. This topic tells you all you need to know about Referrals. 

Daily Quests: 
Go to 'Menu' > 'Quests', you will see all the quests for the day. Each quest is challenging but also gives a good amount of Gems as rewards. 

Guild Gifts: 
You can get free gems from the Guild Gifts. Finish a *Special* Quest with Guild Gift, a free gift will be sent to all your Guild members. Join a Guild today! 

Gem Shop
You can also purchase Gems from the Gem Shop 'Shop' > 'Gems'.

Unfortunately we can’t offer you free gems as that would not be fair to other players.