Gems

Gems are the in-game currency used to advance players' villages. When players first download the game they begin with 500 Gems. Gems can be earned in the game or purchased with real money. The Pirate Flag, Mighty Statue and Builder's Huts are items that can only be purchased with gems. Gems can be used to buy Resources or to speed up upgrades.

Buying Gems
Gems are available in the shop in the following amounts;

Earning Gems
Gems can be earned in the game by completing Achievements or clearing Obstacles. When trees, rocks, bushes, etc. are removed, players receive a small amount of xp (level points) and sometimes earn between 1 - 3 Gems. When you complete challenges in the Achievements menu, for example, 'clear 50 obstacles', players are rewarded with Gems. When players reach 1250 Trophies, they receive 450 Gems. This is the most gems you will be able to gain through achievements, so use them wisely.

Another way to earn gems is to clear Obstacles, which are a never ending source of gems.

Another way to earn Gems is to be one in the Top 10 Players of the Top 3 Clans. At the end of each week the Top 3 Clans earn 10000 Gems for 1st, 5000 Gems for 2nd and 3000 Gems for 3rd which are divided equally amongst the Top 10 Players.

Trivia

 * Clash of clans does not require you to buy gems.