Gems are in-game currency that can be used to purchase many items, including Card Packs, Rare Cards, Traps, Power Potions and Energy Drinks. Gems can also be used to purchase various kinds of promotional items from the in-game store. A player can also purchase a Start Kit only once with gems.
Gems may only be obtained as a purchase using real money. They can be found at the in-game store in various bundles.