Play Only Diamonds Slot for Real Money – Best Casinos, Bonuses, RTP

Introduction to Only Diamonds

Only Diamonds is a casino slot developed by Gamzix, focusing exclusively on diamonds. This game is a sequel to the Only Coins series, which began in 2025 and presented a unique twist by omitting regular paying symbols in favor of a coin collecting mechanism. Following this, Gamzix released Only Coins Express in late 2025, which did not significantly alter the game’s foundation but introduced a train theme. In Only Diamonds, however, the developers have successfully added new elements to enhance the gameplay experience. Notably, the game features no traditional paying symbols or paylines; instead, wins are derived from the Diamond Collecting mechanic in the Respins Bonus Game, supplemented by Mystery Symbols, Jackpots worth up to 500X the bet, and Upgrade Symbols to boost smaller Diamond Wins. This creates a straightforward yet slightly distinctive slot experience, with a maximum win potential of 3,500X the bet.

Theme, Gameplay & Payouts

Only Diamonds is a video slot from Gamzix featuring 3 Reels, a 3-5-3 Row Setup, and 0 Paylines. Players can place a Minimum bet of 0.1 and a Maximum bet of 100. The game offers an average RTP of 96.01% and exhibits medium volatility, resulting in relatively steady wins accompanied by the occasional lucrative bonus game that can help achieve the maximum win of 3,500X the bet.

The graphics display a basic blue background, with a 3-5-3 playing grid filled with various shiny symbols. An upbeat soundtrack complements the experience, accompanied by glittering sound effects that play each time a symbol lands. This game is accessible on most desktops, mobiles, and tablets.

Payout symbols comprise the Diamond Symbols, valued between 1X and 9X the bet. Additionally, various Special Symbols are available to help players secure larger wins, including Mystery Symbols, Jackpot Symbols, Collect Symbols, and Upgrade Symbols, which will be discussed in the next section.

Special Features & Mechanics

What is the maximum win in the slot Only Diamonds?

Players can win up to 3,500X their bet.

What features are available in the slot Only Diamonds?

Available features include Diamond Symbols, Mystery Symbols, Jackpots, Collect Symbols, Upgrade Symbols, Respin Bonus Game, Heap of Diamonds Bonus, and Feature Buy options.

Diamond Symbols

Diamond Symbols function as the game’s primary paying symbols, landing with random values between 1X and 9X the bet. However, unlike regular paying symbols, Diamond Symbols require a Collect Symbol in the Respins Bonus Game to generate payouts.

Mystery Symbols

Mystery Symbols can appear during both the base and bonus games, but they only reveal their value during the bonus game, either through a Collect Symbol or when the feature concludes. These symbols can disclose either a normal Diamond Symbol prize (1X to 9X) or a Jackpot (Mini, Minor, or Major). The bonus game may also feature Mystery Jackpot Symbols that provide the same Jackpot prizes.

Jackpots

Jackpot Symbols can be earned during the bonus game and pay out similarly to Diamond Symbols by landing a Collect Symbol. The available Jackpots are as follows:

• Mini: Awards 10X the bet.
• Minor: Awards 20X the bet.
• Major: Awards 50X the bet.
• Grand: Awards 500X the bet, only achievable by filling all 11 positions on the playing grid during the Respins Bonus Game.

Collect Symbols

Collect Symbols can land during either the base or bonus game, though they only start collecting prizes in the Respins feature. When they land, Collect Symbols reveal any Mystery and Mystery Jackpot Symbols and gather all awards from Diamond, Mystery, Jackpot, and other Collect Symbols.

Upgrade Symbols

Upgrade Symbols can appear in both the base and bonus game. When they land, they upgrade the values of all symbols on the reels to the next tier. Each type is affected as follows:

• Diamond Symbols: Each prize is increased by one step; a 9X Diamond will upgrade to a Mystery Jackpot Symbol.
• Mystery Symbols: Upgraded to a Mystery Jackpot Symbol.
• Jackpot Symbols: Upgraded to the next Jackpot level, not exceeding the Major Jackpot.

After the upgrade, the Upgrade Symbol reveals a random prize ranging from 1X to 9X the bet.

Respin Bonus Game

The Respin Bonus Game can be triggered by landing three Symbols across the active middle row of the grid or via the random Heap of Diamonds Bonus. This feature starts with three Respins, which reset each time a Symbol appears on the reels. The upper-middle and lower-middle positions are special and can only feature Diamond Symbols with a 9X value, Jackpot, Mystery Jackpot, Collect, or Upgrade Symbols. The feature concludes when no spins remain or all positions are filled.

Heap of Diamonds Bonus

Any Diamond Symbol that appears on the active middle row during the base game may randomly activate the Heap of Diamonds feature. When activated, this feature adds enough symbols to the active row to initiate the Respin Bonus Game.

Feature Buy

There are two Feature Buy options that enable players to instantly access the Respins Bonus Game for a price determined by the current bet:

• 30X: Triggers the Respins Bonus Game.
• 75X: Triggers the Super Respins Bonus Game, offering enhanced chances of landing high-value symbols.

Final Thoughts on Only Diamonds

This series may not appeal to everyone, as it remains quite niche. While the game is simple and straightforward, it alters core casino slot mechanics, which is commendable, although Gamzix has yet to fully realize the potential for uniqueness. The foundation of the Only Coins and Only Diamonds titles is appreciated, but the execution leaves some room for improvement. Despite this, there are players who enjoy this series, and it is easy to understand why. However, it does not resonate with us, even as Only Diamonds makes strides toward incorporating more features. Examining the stats reveals an average RTP of 96.01% and a relatively modest maximum win of 3,500X the bet. The game’s distinctiveness is mainly contained within the Respins Bonus Game, where players cannot cash out on paying Diamond Symbols. Although the introduction of the Upgrade Symbol provides a step towards deeper gameplay, it comes at the cost of removing the Walking Multiplier Frame from earlier titles, leading to a balancing act of progress and regression.

In the base game, there isn’t much to engage players, as only the Heaps of Diamonds feature serves to initiate the bonus game. The Respins feature encompasses the game’s core offerings but can prove lacking in generous payouts, with Diamond Symbols capping at 9X and the highest Jackpot being just 50X. For those who enjoyed the previous Only Coin releases or are intrigued by this unique gameplay style, the Only Diamonds demo may be worth a try.

Only Diamonds is a slot without regular paylines, where wins are solely derived from Diamond Symbol prizes and Jackpots.