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Only Diamonds isn’t just a slot–it’s a vault of brilliance. Gamzix delivers 3,500x wins through collect, upgrade, and mystery features, with diamonds stealing the show.
| 🎰 Slot Review: Only Diamonds by Gamzix | |
|---|---|
| Release Date | February 18, 2026 |
| Developer | Gamzix |
| Theme | Diamond, Blue, Classic |
| RTP | 94% |
| Paylines | N/A |
| Volatility | Medium |
| Max Win | 3,500x bet |
| Bet Range | 0.10 min to 100 max |
| Bonus Features | Mystery Symbols, Collect Symbol, Upgrade Symbol, Bonus Game, Jackpots, Buy Bonus |
Only Diamonds
Only Diamonds slot by Gamzix is a refined slot experience focused entirely on the brilliance and value of precious gems. Capturing that classic land-based casino prestige with a clean, shining visual style, the game delivers a premium atmosphere where every feature revolves around collecting and upgrading valuable symbols. In this unique model, the main game builds pure anticipation for a Bonus Game where the real rewards shine–symbols only pay during this feature. With medium volatility, a 3,500x max win, and Buy Bonus options, it’s the perfect Valentine’s Day release.
Only Diamonds Gameplay and Mechanics
Only Diamonds plays across a distinctive 3-5-3 grid with no traditional paylines–symbols don’t pay during the main game at all. The middle row is the active zone, and landing any three symbols there triggers the Bonus Game. That’s where the real action begins.
Once the Bonus Game starts, you get three respins and only Diamond symbols land. Every prize-carrying gem resets the counter. Special upper-middle and lower-middle positions exclusively host 9x Diamonds, Jackpots, Mystery Jackpots, Collect, or Upgrade symbols. Empty positions spin individually until respins run out or every spot locks. Heap of Diamonds can guarantee trigger activation, and Buy Bonus options let you bypass the wait.
Only Diamonds Theme and Visuals
Purple velvet backdrop. Diamonds that actually sparkle. Only Diamonds trades flashy animations for pure sophistication–the kind of quiet luxury you’d find in a private casino lounge.
The cross-shaped grid puts gems front and centre, while gold-framed jackpot meters hover above like trophies waiting to be claimed. Neon buttons add a modern pulse, but the real stars are the diamonds themselves–crisp, luminous, each one holding cash values or mystery rewards. It feels exclusive. Like you’ve walked into the VIP section.
How To Play
Here’s an overview of how to handle game controls.
- Click the Stacked Coin button to open the bet menu.
- Click Autoplay to choose a number of autospins.
- Press the Spin button to play.
Other important settings, such as sounds, fast spins, and turbo spins, can be customised by pressing the three-bar menu button. The “i” button gives you access to the game rules, bonus features, paytable, and payline information.
Only Diamonds RTP, Volatility, and Betting Range
With an RTP of 94%, Only Diamonds sits below the industry standard, offering fair value without compromise. Medium volatility keeps the pace, while bets from 0.10 to 100 welcome both casual players and high rollers chasing that 3,500x max win.
Only Diamonds Slot Features
Ready to play? Here’s how Only Diamonds actually works–from respins to jackpots, collect to upgrade.
Bonus Game
Trigger the Bonus Game with 3 respins when any 3 symbols land on the active row or via the Heap of Diamonds feature. Only Diamond symbols land during the feature–each carrying random prizes from 1x to 9x the bet, Jackpot, Collect, Upgrade, Mystery, or Mystery Jackpot values. Every qualifying symbol resets the spin counter to 3. The upper-middle and lower-middle positions are special: only 9x Diamond, Jackpot, Mystery Jackpot, Collect, or Upgrade symbols appear there. Trigger symbols carry over. Empty positions spin individually. The game ends when respins hit zero or all positions lock.
Mystery Symbols
Mystery symbols appear in both main and Bonus Games. At the Bonus Game end or during collection, they reveal 1x to 9x the bet or a Jackpot–Mini (10x), Minor (20x), or Major (50x). Mystery Jackpot symbols in the Bonus Game award one of those three jackpots.
Collect Symbol
Collect symbols in the main game, but the collection starts at the Bonus Game trigger. They first reveal Mystery and Mystery Jackpot prizes, then gather values from all symbols left to right, top to bottom–including Mystery, Mystery Jackpot, Diamond, Jackpot, and other Collect symbols. Multiple Collect symbols trigger sequentially; the second begins only after the first finishes.
Upgrade Symbol
Upgrade symbols land in both main and Bonus Games, upgrading all other symbol prizes on the reels. Diamond values increase by 1x the bet. A 9x Diamond or Mystery symbol upgrades to Mystery Jackpot. Jackpots upgrade to the next level–except Major, which stays. After upgrading, the Upgrade symbol reveals its own random prize of 1x to 9x the bet. It never upgrades itself or other Upgrade symbols.
Bonus Game Jackpots
Jackpot symbols appearing randomly in the Bonus Game award: Mini (10x), Minor (20x), or Major (50x the bet). These pay only during the Bonus Game. The Grand Jackpot of 500x the bet is won by filling every position at the Bonus Game end, added on top of all symbol values landed.
Heap of Diamonds
Any Diamond symbol landing on the active row in the main game can trigger the Heap of Diamonds feature, adding enough Diamond symbols to guarantee Bonus Game activation. These added symbols may include Diamonds, Jackpots, Mystery, or Mystery Jackpots. The visual diamond pile above the reels is decorative only.
Buy Bonus & Buy Super Bonus
Jump straight in. Buy Bonus costs 30x the bet. Buying Super Bonus costs 75x the bet and increases the chance of landing high-value symbols. Both trigger one guaranteed Bonus Game spin.
What We Like
- Unique 3-5-3 grid
- Feature-rich bonus game
- Collect & upgrade mechanics
- Grand jackpot 500x
- Buy bonus options
What Could Be Better
- Below average RTP
- No base game wins
- No free spins feature
Final Verdict
Only Diamonds delivers exactly what it promises: a sleek, gem-focused experience where the bonus game is everything. The 3-5-3 grid feels fresh, and the collect, upgrade, and mystery mechanics keep respins exciting. Visuals impress with genuine sophistication–purple velvet backdrop, sparkling diamonds, gold-framed jackpots. But the 94% RTP stings, especially with no base game wins to soften the wait. Medium volatility suits most players, and the 3,500x max win (plus 500x Grand Jackpot) provides real thrill potential. Buy bonus options offer instant access, though the 75x for Super Bonus is steep. Perfect for feature hunters who love respin mechanics. Casual players may find the main game dull.
Rating: ★★★☆☆ (3.7/5)
Best For: Players who love Classic themes and feature-rich slots
Try it if you like: Only Coins, Only Coins Express, Ruby Win Hold the Spin
FAQs
What is the RTP of Only Diamonds?
The slot RTP is 94%, which sits below the industry average of 96%.
Can you win in the main game?
No. Symbols only pay during the Bonus Game.
How do you trigger the Bonus Game?
Land any three symbols on the active middle row or trigger the Heap of Diamonds feature.
What is the max win?
3,500x your total bet, plus a 500x Grand Jackpot for filling all positions.
Are there Buy Bonus options?
Yes. 30x bet for regular Bonus, 75x for Super Bonus with higher-value symbols.
