Angryverse/Gem

Gems are shameless money-grabs shiny crystals used as a currency for multiple purposes depending on which game they're used in, they are usually very hard to obtain, but you can always pay actual money to get a couple hundreds or thousands.

Angry Birds
Gems are the rarest currency in the game. In the game, they can be used to buy the following things: They can be obtained in the following ways:
 * Coins
 * Prize Eggs and
 * TNT Shield Power-Up.
 * By passing a league in the Mighty League;
 * Inside Prize Eggs
 * Completing 5 levels in an episode.
 * By buying them in the shop with real money.

Angry Birds Go!
Gems are a secondary currency in the game. They can be obtained in the following ways; They can be obtained in the following ways:
 * To purchase refill energies;
 * To upgrade karts and
 * To open Premium Toolboxes.
 * × 40''' to open 1 prize.
 * × 400''' to open 11 prize.
 * Inside toolboxes.
 * By buying them in the shop.

Angry Birds Transformers
Gems are a secondary currency in the game. They can be used for the following things:


 * Speed up and complete upgrades;
 * Recharges;
 * Open missions;
 * Purchase Accessories;
 * Destroy difficult levels (which can only be used a matter of three times; each use increases the number of gems needed for the next attack);
 * Unlock covered levels to play bonus coin double levels
 * Change your Transformer into a different Transformer from an event for 1 gem.

They can be obtained by the following ways:


 * Through completing achievements.;
 * Through completing missions;
 * Inside Treasure Chests;
 * By buying them with real money;

Angry Birds Fight!
Gems are a secondary currency in the game. They can be used for the following things: They can be obtained as rewards after battles or by buying them.
 * Refill Energy;
 * To unlock birds immediately using 6 Gems.
 * To open Mighty Eagle's Treasure Box using 6 Gems in the Slot game.

Angry Birds POP!
Gems are a secondary currency in the game. They can be used for: They can be obtained in the following way;
 * Buying costumes for the birds.
 * As rewards in events.

Angry Birds 2
Gems are the primary currency in the game. They can be used for the following things:


 * Continuing a level when there are still pigs remaining;
 * 1st continue: 60 gems
 * 2nd continue: 180 gems
 * 3rd continue: 360 gems
 * 4th continue: 720 gems
 * 5th continue and onwards: 1440 gems
 * Shuffling bird cards
 * Restarting a room
 * Opening Chests:
 * Premium Chest: Rare - Costs  × 80 to open
 * Legendary Chest: Legendary - Costs  × 900 to open, used to be 24 rare chests
 * Play the Tower of Fortune;
 * Continuing a Tower of Fortune Run:
 * First Pig: 20 gems
 * Second Pig: 50 gems
 * Third Pig: 100 gems
 * Fourth Pig: 200 gems
 * Fifth Pig: 400 gems
 * Sixth Pig: 800 gems
 * Seventh Pig: 1,600 gems
 * Eighth Pig and onwards: 3,200 gems
 * Buying Lives;
 * Buying an bird;
 * Buying random daily deals

They can be obtained by the following ways:
 * Completing daily quests;
 * As a Reward in Chests;
 * As a Clan Reward;
 * As an Arena Reward;
 * In a Tower of Fortune card;
 * By buying them in the shop.

Angry Birds Action!
Gems are a secondary currency in the game. They can be used for the following things: They can be obtained in the following ways:
 * Revive a Bird and
 * Buy Power-Ups
 * As a reward in the Mistery Reward Boxes;
 * As a reward in Daily Prize Boxes
 * By buying them in the shop.

Angry Birds Evolution
Gems are a secondary currency in the game. They can be used for the following things: They can be obtained by the following ways:
 * Hatch Eggs;
 * Buy Scout Energy;
 * Buy Remaining Items;
 * Buy Event Items and
 * Revive Birds;
 * Defeating Pigs;
 * Defeating Thief Pigs;
 * Defeating Gem Pigs;
 * In Chests;
 * Doing Scout Missions;
 * As Event Rewards and
 * By Buying in the Shop.

Angry Birds Match
The gems are currency in Angry Birds Match that can be used to purchase keys for the premium chests, to refill lives, or to purchase boosters or extra moves for the levels.

Gems can be purchased from the in-game shop. You can also win them from different events and Leagues.

Angry Birds Tennis
Gems are used as a currency in the game. They can be used to buy characters, token doublers and more.