Thinking about giving Grand Express Diamond Class a spin? We tested it thoroughly so you know what to expect. Built by RubyPlay, it lands as a game with a very high-variance maths model and a return-to-player rate of 96.37%. Originally released in 2020, it has aged well. If everything lines up, Grand Express Diamond Class can pay up to 200,000x your bet. It's dressed up with a diamond and gem theme and plays out on 25 paylines across 5 reels. But is it actually worth playing? Read on.
Written by Rachel Kim · Last updated: January 2026
Grand Express Diamond Class comes to us from RubyPlay, themed around diamond and gem. It runs on 25 paylines across 5 reels with a very high-variance maths model, and an RTP of 96.37%.
Where Grand Express Diamond Class earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. With very 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 RubyPlay catalogue.
The RTP of 96.37% is right around the industry average of ~96%. This represents a fair return that's in line with what most modern slots offer.
Very high volatility delivers the most extreme payout profile — long dry spells punctuated by potentially massive wins. Only recommended for experienced players with substantial bankrolls and high risk tolerance.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Grand Express Diamond Class 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
Grand Express Diamond Class by RubyPlay is a solid offering that delivers good entertainment value. The 96.37% RTP combined with very high volatility creates a well-balanced gaming experience.