Our review of Thunder Gems cuts through the marketing and looks at what matters: how it plays and how it pays. Built by Octavian Gaming, it lands as a title with medium low variance and a return-to-player rate of 95.2%. You get 5 reels and 10 paylines, all dressed up with a gem theme. Originally released in 2023, it has aged well. The maximum win sits at 5,000x, so there's serious upside on the table. But is it actually worth playing? Read on.
Written by Emma Roberts · Last updated: March 2026
Thunder Gems is a game from Octavian Gaming, leaning into a gem aesthetic and powered by 5 reels and 10 paylines. The result is a medium low-variance maths model paired with a published RTP of 95.2%.
Where Thunder Gems earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. Thanks to its medium low variance, wins come often enough to suit casual, lower-risk play. On balance, Thunder Gems is a dependable option worth a few spins in the demo first.
At 95.2%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
Medium-low volatility offers a good balance of regular wins with occasional larger payouts. Expect frequent hits with modest amounts, suitable for casual players who want low-risk entertainment.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Thunder Gems features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
Thunder Gems by Octavian Gaming is a solid offering that delivers good entertainment value. The 95.2% RTP combined with medium low volatility creates a well-balanced gaming experience.