Play Mermaid’s Diamond Online

Mermaid’s Diamond is a Play’n GO underwater video slot released on 20 September 2017, built around a diamond-shaped reel frame rather than a rectangular grid. The slot arranges five reels in a 3-4-5-4-3 row pattern and pays across 720 ways, evaluated from both the leftmost and the rightmost reel. Its feature set draws on Greek sea mythology, with a mermaid wild that expands to fill a reel and a Poseidon mechanic that can intervene on a spin that would otherwise pay nothing.

Mermaid’s Diamond Game Overview

Mermaid’s Diamond presents each spin on a five-reel layout whose columns hold three, four, five, four and three positions in turn, producing the diamond silhouette the title refers to. That arrangement generates 720 ways to win, so combinations are assessed on adjacent reels rather than along drawn paylines. The mermaid acts as the wild symbol and the treasure chest as the scatter.

Mermaid’s Diamond evaluates its combinations in both directions, which means a sequence beginning on reel five counts alongside one beginning on reel one. The slot supports this base game with three named mechanics — expanding mermaid wild reels, Divine Intervention and a diamond collection that runs during the bonus round. Wildz lists the title as a medium-volatility slot with a maximum win of 5,000 times the stake.

Mermaid’s Diamond Key Game Details

Mermaid’s Diamond has the following principal specifications:

• Developer: Play’n GO

• Release date: 20 September 2017

• Game category: Video slot

• Theme: Underwater and Greek sea mythology

• Playing area: 5 reels in a 3-4-5-4-3 pattern

• Winning system: 720 ways, evaluated in both directions

• Wild symbol: Mermaid, which expands to cover a full reel

• Scatter symbol: Treasure chest

• Free Spins trigger: 5 treasure chests anywhere on the reels

• Free Spins awarded: Up to 25, revealed by opening a chest

• Diamonds needed for Trident Wilds: 5, collected during the bonus round

• Main mechanics: Wild Reels, Divine Intervention, Free Spins and Trident Wilds

• Maximum win potential: 5,000x stake

• Jackpot: None

• Default RTP: 91.47%

• Volatility: Medium

• Bet range: 0.20 to 100 per spin

• Supported formats: Desktop and mobile

Mermaid’s Diamond is listed by Wildz with a default RTP of 91.47%, medium volatility and a maximum win of 5,000x the stake. The mathematical configuration and the permitted stake range presented by a UK-licensed casino can vary, so the information panel inside the version being played is the relevant source for its current RTP and betting conditions.

How Does Mermaid’s Diamond Work?

Mermaid’s Diamond starts a round when a stake is confirmed and the five reels come to rest across the 3-4-5-4-3 frame. A win forms when matching symbols occupy adjacent reels, counted from reel one towards reel five and from reel five back towards reel one. Because the columns differ in height, the number of possible symbol paths reaches 720 rather than a fixed count of lines.

Mermaid’s Diamond pays each qualifying combination once per direction and settles the round before the next stake is taken. The slot may then apply one of its wild mechanics to the finished layout, or move a treasure chest onto the reels towards the bonus trigger. Every outcome is produced by the game’s random number generator, so no stake size or sequence of previous spins changes what the next arrangement will be.

Mermaid’s Diamond 720 Ways to Win

Mermaid’s Diamond replaces conventional paylines with a 720-way structure created by its uneven reel heights. Three positions on the outer reels and five on the centre reel multiply out to the full count, and every combination of adjacent matching symbols is assessed automatically. Players do not select a number of lines, so the stake covers all 720 ways on each spin.

Mermaid’s Diamond also counts combinations that begin on the right-hand side, which is why the game is described as paying both ways. This widens the number of ways a set of symbols can qualify, but it does not change the slot’s underlying return: the ways structure is part of the game’s programmed mathematics and cannot be adjusted, extended or targeted by a particular betting pattern.

Mermaid’s Diamond Wild Reels

Mermaid’s Diamond turns its mermaid symbol into a full wild reel whenever two or more mermaids land on the same reel. The character stretches across every position in that column, and the reel then substitutes for regular symbols in any combination it can complete. A single expanded reel can therefore contribute to several of the 720 ways at once.

Mermaid’s Diamond applies the expansion automatically once the qualifying condition is met, with no additional stake and no player input. The number of mermaids arriving on a reel is decided by the random result of that spin, so the wild reel cannot be triggered on demand and a run of spins without one does not make the next expansion any more likely.

Mermaid’s Diamond Divine Intervention

Mermaid’s Diamond gives Poseidon a direct role through the Divine Intervention mechanic. On a spin the sea god may raise his trident and place extra wild symbols onto the reels, converting a layout that had produced nothing into a paying one. The intervention resolves within the same round and does not require a further wager.

Mermaid’s Diamond also uses the same mechanic at the bonus threshold. When four treasure chests land on a spin that has not otherwise paid, Divine Intervention can add the fifth chest needed to open the Free Spins round. Whether it activates on any given spin is determined entirely by the game’s random system, and no stake level, autoplay setting or previous result makes it more probable.

Mermaid’s Diamond Free Spins

Mermaid’s Diamond opens its bonus round when five treasure chests appear anywhere across the reels, either landing naturally or completed by Divine Intervention. The player is then invited to open one of the chests, and the chosen chest reveals the number of free spins awarded, up to 25. The reveal is part of the trigger sequence rather than a separate pick-and-click feature with its own paytable.

Mermaid’s Diamond runs the free spins at the stake that triggered them and keeps the 720-way structure and the mermaid wild reels in place throughout. The size of the award depends on which chest is opened and on the values the game has generated for that round, so a bonus cannot be steered towards its upper limit by selecting a particular chest.

Mermaid’s Diamond Trident Wilds

Mermaid’s Diamond runs a diamond collection alongside the free spins. Each diamond symbol landing during the round is added to a meter, and filling the meter with five diamonds summons Poseidon to place Trident Wilds onto the reels. Those wilds behave as substitutes in the same way the mermaid does, so they can complete several ways in a single spin.

Mermaid’s Diamond resolves the collection through the same random model as the rest of the game. Diamonds arrive as ordinary spin results rather than on a schedule, which means a bonus round may end before the meter fills, and the Trident Wilds award is never guaranteed by the number of free spins remaining.

Mermaid’s Diamond RTP

Mermaid’s Diamond carries a theoretical RTP of 91.47% in the version listed by Wildz. That percentage describes the game’s calculated long-term return across a very large volume of wagering, not the result a player should expect from a single session. It sits below the level commonly used for modern video slots, which is a straightforward consequence of the mathematical build supplied for this market rather than a statement about any individual spin.

Mermaid’s Diamond may be offered with a different permitted RTP setting through another operator or market, since Play’n GO supplies more than one configuration of the title. Opening the game information menu before wagering therefore gives the accurate percentage for the specific version in use.

Mermaid’s Diamond Volatility

Mermaid’s Diamond has a medium-volatility profile as listed by Wildz. In practice that describes a distribution in which regular smaller returns from the 720-way structure sit alongside less frequent larger results from the wild reels and the bonus round. It is a description of how payouts are spread, not a prediction of when any of them will occur.

Mermaid’s Diamond volatility does not change during play, and it applies equally to the base game and the free spins. A sequence of unsuccessful rounds does not increase the probability that a large result must follow, because each spin is generated independently of the ones before it.

Mermaid’s Diamond Maximum Win

Mermaid’s Diamond offers a maximum win of 5,000x the total stake in its standard listed configuration. A qualifying £1 stake would therefore correspond to a theoretical upper limit of £5,000 before any separate operator restrictions are considered. The game carries no jackpot of any kind, so this figure is the complete ceiling rather than a base-game total sitting beneath a progressive pool.

Mermaid’s Diamond requires an exceptional combination of expanded wild reels, Divine Intervention and a productive bonus round to approach that number. The advertised maximum should be read as a technical limit of the game’s mathematics and not as a representative return from ordinary play.

How to Play Mermaid’s Diamond in the United Kingdom

Mermaid’s Diamond can be played in the United Kingdom through an online casino holding the appropriate Gambling Commission permission and carrying the Play’n GO title. After account registration and age verification, a player can open the game, review the paytable and rules, select a permitted stake from the 0.20 to 100 range and start a spin.

Mermaid’s Diamond stakes are also governed by the United Kingdom’s statutory online slot limits. Players aged 18 to 24 can stake no more than £2 per game cycle, while customers aged 25 and over have a £5 maximum. Those limits have applied since 21 May 2025 and 9 April 2025 respectively, and they take precedence over the provider’s wider default range.

Can You Play Mermaid’s Diamond on Mobile?

Yes, Mermaid’s Diamond can be played on compatible smartphones and tablets. Play’n GO builds the title for both desktop and mobile, and the diamond-shaped 3-4-5-4-3 reel frame rescales to portrait and landscape displays without any of the 720 ways being removed.

Mermaid’s Diamond mobile play normally runs directly in a supported browser rather than through a separate download. The same UK age-verification, licensing and stake-limit requirements continue to apply when the game is opened on a phone instead of a desktop computer.

Can You Play Mermaid’s Diamond for Free?

Yes, Mermaid’s Diamond has a free demo that uses virtual credits instead of real-money stakes. The demo runs the same 720-way base game, mermaid wild reels, Divine Intervention and Free Spins round, which makes it a practical way to see how the diamond collection fills before committing a real balance.

Mermaid’s Diamond demo results cannot be withdrawn, because the round is settled in virtual credits rather than deposited funds. Free-play access through a British licensed operator remains subject to UK age protection: Gambling Commission rules require remote licensees to verify age before giving customers access to free-to-play versions of gambling games.

Mermaid’s Diamond in the United Kingdom

Mermaid’s Diamond can be offered to players in the United Kingdom by online casinos that hold the appropriate Gambling Commission licence and carry the Play’n GO catalogue. British customers must be at least 18 years old, complete the required verification procedures and stay within the statutory online slot stake limits.

Mermaid’s Diamond is listed on Wildz internationally, but Wildz states that customers visiting from the United Kingdom are redirected to partner casinos. UK players should therefore use the Gambling Commission public register to confirm that the casino they end up using is authorised for the British market, rather than assuming the international Wildz platform accepts UK registrations.

United Kingdom Rules for Mermaid’s Diamond

Mermaid’s Diamond real-money play in the United Kingdom falls within the regulatory system supervised by the Gambling Commission. Operators serving customers in England, Scotland and Wales must hold the appropriate remote licence, and the Commission maintains a public register that lets a player check a gambling business before depositing money.

Mermaid’s Diamond players must be 18 or older to gamble online in the United Kingdom. Licensed businesses are required to verify customer identity and age before gambling is permitted, with the minimum verification information covering name, address and date of birth.

Mermaid’s Diamond players should also distinguish Great Britain from the United Kingdom as a whole when interpreting these rules. The Gambling Commission regulates gambling in England, Scotland and Wales under the Gambling Act 2005, while Northern Ireland operates under a separate legal framework.

FAQs

How does Mermaid's Diamond work?

Mermaid's Diamond arranges five reels in a 3-4-5-4-3 pattern, which produces 720 ways to win instead of fixed paylines. Matching symbols on adjacent reels pay, counted from either end of the reel set, and one stake covers all 720 ways on every spin.

What is the RTP of Mermaid's Diamond?

Mermaid's Diamond carries a theoretical RTP of 91.47% in the version listed by Wildz. The figure is a long-run calculation across a very large number of spins, not a session prediction. Play'n GO supplies more than one setting, so check the in-game information menu before wagering.

Can you play Mermaid's Diamond on mobile?

Yes. Play'n GO builds Mermaid's Diamond for desktop and mobile in one version, so the diamond-shaped reel frame, all 720 ways and the three feature mechanics rescale to phones and tablets. The game normally loads in a supported browser with no download required.

Can you play Mermaid's Diamond for free?

Yes. Mermaid's Diamond has a demo that runs on virtual credits, covering the same base game, mermaid wild reels, Divine Intervention and Free Spins round. Demo results cannot be withdrawn, and UK licensed operators must verify age before granting access to free-to-play games.