Curious what Colossal Diamonds actually feels like to play? Here's our full, no-fluff take. AGS are the developer behind it, tuning the slot game for a medium volatility profile, with 95.53% RTP. The maximum win sits at 5,000x, so there's serious upside on the table. It's dressed up with a gem theme and plays out on 5 reels and 25 paylines. Originally released in 2024, it has aged well. So does it deliver? Let's get into it.
Written by Michael Torres · Last updated: February 2026
This slot game, Colossal Diamonds, is the work of AGS, wrapped in a gem theme. It runs on 5 reels and 25 paylines with medium variance, and a return-to-player rate of 95.53%.
Where Colossal Diamonds earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. The medium volatility strikes a middle ground that should suit most playing styles. All told, it's a solid entry in the AGS catalogue.
At 95.53%, 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.
A balanced volatility profile with a mix of smaller frequent wins and occasional larger bonus payouts. Suitable for players who want steady action without extreme swings.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Colossal Diamonds 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
Colossal Diamonds by AGS is a solid offering that delivers good entertainment value. The 95.53% RTP combined with medium volatility creates a well-balanced gaming experience.