If you're trying to work out whether Cool Diamonds II is worth your time, this hands-on review breaks it down. Built by Amatic, it lands as a game with a high-variance maths model and a return-to-player rate of 96.3%. It's dressed up with a diamond and gem theme and plays out on a 5-reel grid running 40 paylines. The maximum win sits at 125,000x, so there's serious upside on the table. Dating back to 2018, it remains a regular pick. Here's how it stacks up.
Written by James Holloway · Last updated: February 2026
At its core, Cool Diamonds II is a release produced by Amatic. Presentation-wise it's themed around diamond and gem, and it leans toward a high volatility profile at 96.3% RTP. Under the hood you'll find 40 paylines across 5 reels.
Dig into the bonuses and Cool Diamonds II starts to stand out. Look out for scatter symbols that unlock free spins and extra bonus rounds. With high variance, this one is aimed at players who can ride out the swings for the top wins. All told, it's a solid entry in the Amatic catalogue.
The RTP of 96.3% is right around the industry average of ~96%. This represents a fair return that's in line with what most modern slots offer.
High volatility means longer gaps between wins, but when wins do land, they can be significantly larger. A bigger bankroll and patience are recommended for this type of slot.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Cool Diamonds II 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
Cool Diamonds II by Amatic is a solid offering that delivers good entertainment value. The 96.3% RTP combined with high volatility creates a well-balanced gaming experience.