Gems are a rare and valuable resource in Township. They unlock access to special features: you can use them to purchase Laboratory boosters, acquire unique decorations in the Store, and exchange them for animal cards in the Zoo.
What can you spend Gems on
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Laboratory boosters
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Unique decorations in the Store
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Animal cards in the Zoo
 
There are three types of Gems in the game: topaz, emerald, and ruby. You can check your current balance in the Laboratory.
How to obtain Gems
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Sending a fully loaded plane
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Chests and new levels in the mine
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Purchasing missing Gems with T-cash
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Chests on ships and floating chests near islands
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Prizes in the House of Luck
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Gift chests from friends
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Rewards for participating in regattas