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Stellar Diamonds bolts a different feature to every reel
When Logic Labs took the oldest symbol set in the business, cherries, a bell, a red seven, and dropped it into a drifting purple nebula, they decided to give each of the five reels a distinct feature of its own. Everything in this game runs through a single symbol. The diamond pays more than anything else on the board, it triggers all five features, and it feeds the four prize meters stacked down the left edge of the screen. Underneath that heavy lifting, it is a straightforward 5×3 machine with 25 fixed lines. Released by Playtech at the end of August 2026, it runs a 95.85% RTP with a maximum win ceiling of 1,591x the bet.
One feature per reel, and the diamond decides
Above each reel sits a small icon spelling out exactly what that column can do: a safe on reel 1, x2 on reel 2, FREE GAMES on reel 3, x3 on reel 4, and a wheel on reel 5. A diamond landing anywhere on a reel hits the icon above it and may trigger that specific feature. Because the assignments never move, there is absolutely no way to reach the wheel except through reel 5, and no way to reach the safe except through reel 1.
The word “may” does an enormous amount of work here, and the game is upfront about it, constantly cycling a line of yellow text under the reels to remind you that a diamond only might trigger a feature. During my session, I landed diamonds directly under the x3 icon, on the wheel reel, and on the free games reel, and watched them all quietly fail to fire. Most of the time, a diamond is simply the best-paying symbol on the board that also just failed a background roll you never get to see.
The Blue Hot Zone is the saving grace that deletes the word “may” entirely. Before the reels drop, any reel can light up with a bright blue background. If a diamond lands on a blue reel, it triggers that reel’s feature outright. I love that both halves of this lottery are visible before the spin even resolves: you know exactly which column you need before anything lands, and then you just watch to see if the diamond arrives. It is a highly effective piece of design, and it carries the entire weight of this fruit machine on its back.
The four meters, and the one road to them
The GRAND, MAJOR, MINOR, and MINI prizes start at 100x, 50x, 20x, and 10x the bet. At a €5 stake, that translates to €500, €250, €100, and €50. Because these are bet multiples rather than a shared progressive pot, raising the stake scales them perfectly. When I raised the stake fifteenfold, all four meters moved up by exactly fifteen times.
They do not just sit still, either. Over the course of playing, my GRAND drifted from 500.00 to 502.00, the MINOR from 100.00 to 101.00, and the MINI from 50.00 to 51.00. This happens because every diamond that lands on reel 1 or reel 5 can nudge one of the four meters upward. It is a clever touch that gives the meters something to do during the long stretches when you are not actively winning them, keeping the left side of the screen feeling alive.
Getting your hands on those prizes is the real catch. They are only ever awarded in the safe pick, which lives exclusively on reel 1. You are presented with twelve safes to open, and the first prize revealed three times is the one you take. Reel 5’s wheel is the only other big-ticket route in the base game, paying out 5x, 8x, 10x, 15x, 25x, 40x, 80x, or 120x the bet, or occasionally handing back the safe pick or the free games instead. It is worth noting the floor on that wheel: 5x the bet is €25 at a €5 stake, which is only a third of what a simple line of five diamonds pays.
Five free games, and what €350 bought
The feature cart sells one thing at one price: €350 at the €5 base bet, or 70x whatever you are staking. That price buys you the free games and nothing else. You cannot buy the safe, you cannot buy the wheel, and you cannot buy a guaranteed diamond. The bought round also runs at 95.83%, a shade under the base game.
The round itself grows the grid to 5×5 and doubles the paylines to 50. It also pins reels 2 and 4 permanently blue, meaning the two multiplier reels are the only guaranteed features in play. When both fill with diamonds on the same spin, your wins multiply by six. However, reels 1, 3, and 5 can never light up during this bonus, which means the safe, the wheel, and a full retrigger are completely off the table. The only way to extend the round is by landing a +1 or +2 symbol anywhere in view.
Five spins is a brutally short window. There are no tiers or scaling mechanics, and the bought round is identical to the one you can trigger naturally on reel 3. I bought it twice at €350 and played the second one out to a meager €84, which is just 0.24x the purchase price. Even when the grid is five rows deep, the wins can be stubbornly small, catching a €10 line of sevens during one round only nudged my running total to €34. One final quirk is that the round refuses to play itself: the award card waits for a click, and then every single one of the five games demands its own manual press of the spin button.
Fruit machine in a nebula
The space setting is wallpaper and nothing more, a drifting purple cloud with the odd shooting star, holding a grid that floats without a frame. Look at the reels, and you are playing a classic land-based fruit machine: cherries, lemon, plum, orange, watermelon, grapes, bell, horseshoe, and a red seven.
The diamond is the lone symbol that actually belongs to the cosmic theme, and it carries the entire identity of the game. It is the wild, the top payer, the feature trigger, and the feeder for the meters. Meanwhile, the four black plaques down the left side give the whole setup the unmistakable look of a jackpot cabinet sitting on a casino floor.
The paytable is intentionally small and flat. Five diamonds on a line pays 15x the bet, five sevens pays 10x, and the values fall away fast after that. Over half the symbol set is duplicated to fill space: the bell and horseshoe pay the same, the watermelon and grapes pay the same, and the orange, lemon, plum, and cherry are just four different drawings of one identical payout tier. You have ten symbols but only six actual pay levels. Set that 15x top line against a win ceiling of 1,591x, and the design statement is obvious. Symbol combinations are not how you win here; they are just how you pass the time until a feature fires.
Pros and cons
Good
- The hot zone mechanic is highly legible before the reels stop. Knowing exactly which column you need creates far more tension than a standard 25-line fruit machine usually manages.
- The wild is the best paying symbol in the game at 15x, meaning a diamond that triggers nothing still pays out something.
- The four prizes are bet multiples, so a 100x GRAND scales with the stake: a real target at €0.20 and at €50 alike.
- The meters creep upward during a session, giving the interface a steady pulse.
Bad
- The €350 buy does not reach the safe pick, locking you out of the only large prizes in the game.
- Five free games make for an incredibly short round, and my session returned just €84 on a €350 spend.
- The “may trigger” rule resolves to a no far more often than a yes.
- You have to manually press spin through every single free game on a bonus that just cost you 70x the stake.
Verdict
My €350 buy came back at €84, and it was never able to touch the four prizes the left-hand side of the screen advertises all session. That perfectly summarizes the shape of this game: the feature you can actually pay for is the third best one it has. The two features you genuinely want both require a diamond to land on one specific reel, and then you have to win a hidden roll on top of that.
What is genuinely great here is the blue zone, a two-condition lottery you can read at a glance, built beautifully into a machine made of cherries and bells. What hurts the experience is the frequency. Watching diamonds arrive on feature reels only to do absolutely nothing takes the wind out of the game’s sails. My advice? Play it at the bottom of the bet ladder and wait for reel 1 to light up blue. That safe pick is the only road to the 100x GRAND, and the €350 cart will never take you down it.
