The premium currency. Used as an optional shortcut to buy Gold, cards, chests, offers, Pass Royale and to skip timers; the only currency purchasable with real money.
Removed/legacy Elite Wild Cards were auto-converted into Gems in the Nov 2024 rework.
Most players get the most out of saving them for Pass Royale or special offers that bundle Wild Cards and Evolution Shards. Spending Gems to skip small amounts of Gold or single chests is the classic beginner leak.
Yes — one-time Trophy Road milestones, Pass Royale tiers, daily shop deals, challenges and Collection Level milestones all pay Gems. Slowly, but they add up if you don't drip-spend them.