- Above-average RTP of 96.5%
- Mermaid wilds
- Entertaining Trident bonus feature
- Good max win potential of 5,000x
- Free spins can take a while to trigger
- Diamond reel layout can feel confusing
Contents
Mermaids Diamonds Slot Overview
The Mermaids Diamonds slot is from the Play'n GO slots, catalogue, which includes Raging Rex 2. Mermaids Diamonds is an online casinos-style slots game, with an undersea theme. It features mermaids, shells, and underwater creatures on diamond-shaped reels (3-4-5-4-3).
This slot's RTP is 96.5%, which is above average for slots of this type. The volatility is medium, so it would be fair to expect moderate wins to occur reasonably often and larger wins to be rarer. The maximum win multiplier is 5,000x the stake, so there is decent payout potential.
The base game is interesting, largely due to the unusual reel layout. Beyond this, several features enhance the gameplay, such as the Treasure Chest bonus with its generous 25 free spins, a wild symbol, and the Trident bonus rounds.
Mermaids Diamonds Appearance
Mermaids Diamonds takes players on an underwater adventure through well-designed theming and graphics.
Theme
The mermaid’s undersea home is depicted with gems, seashells, and starfish, and the overall look of the game makes for an entertaining gaming experience.
Graphics
The symbols are designed in bold graphics with a vibrant colour palette. The background is interactive, with sea plants waving in the water and schools of fish swimming by. This keeps things feeling lively.
Audio
Undersea sound effects are layered over soft, ocean-inspired music, creating a relaxed but upbeat atmosphere.

Mermaids Diamonds RTP & Volatility
The RTP of Mermaids Diamonds slot is 96.5%, while the volatility is medium. The Mermaids Diamonds top win is 5,000x.
How to Play Mermaids Diamonds
Let's check out how to play Mermaids Diamonds:
- Players begin by setting the coin size, representing their desired bet, before spinning the reels.
- There are no fixed paylines in the base game; instead, there is a ways to win system.
- Wins are triggered by matching three winning symbols from left to right on adjacent reels.
- Remember to set a responsible budget before playing and to take a timeout or period of self-exclusion if necessary.
How to Win at Mermaids Diamonds
Let’s move on to the key information: how the wins formed:
- Mermaids Diamonds has a ways to win system instead of fixed paylines.
- Prizes are triggered when a minimum of three matching winning symbols land from left to right on adjacent reels.
- The more symbols matched, the bigger the payout.
Wilds
The mermaid symbol is a wild, substituting for regular symbols to help form wins. Additionally, a random Trident feature can add extra wilds for bigger payouts.
Mermaids Diamonds Gameplay Flow & Systems
From the base game to the bonuses, the gameplay in Mermaids Diamonds is straightforward:
- Bets start at 20p and offer choices for both high- and low-stakes gamers.
- Players need to match three or more winning symbols.
- Any prizes won are automatically highlighted and paid out by the game.
Mermaids Diamonds Overview of Win Rules & Symbols
The highest-paying symbol is the mermaid wild, which not only helps to complete wins but also offers decent payouts of its own. The top regular symbol is the pearl necklace, followed by the treasure chest (also the scatter symbol), gold crown, seahorse, and starfish, which all pay medium amounts. The lower payers are the usual playing card symbols.
Players are most likely to win any higher prizes in the bonus games. These are triggered by landing enough of the treasure chest scatter symbol.
Mermaids Diamonds Bonuses
The Mermaids Diamonds bonus features add more solid gameplay:
Trident Bonus
An interesting, random bonus in Mermaids Diamond is the Trident bonus. On random spins, the game adds one or two wilds to the reels to boost players' odds of hitting generous winning combinations.
Divine Intervention
Mermaids Diamonds provides players with the opportunity to hit winning combinations even on losing spins. Should players hit a non-winning spin with four scatters, the Divine Intervention bonus can be triggered, adding the fifth and final scatter to trigger free spins.
Free Spins
When the free spins round is triggered, five treasure chests will appear. Players pick from these to reveal the number of free spins that will be awarded, with up to 25 available.
During this round, more free spins can be triggered if three, four, or five scatters land; technically speaking, the bonus can be retriggered indefinitely. Diamond symbols are collected during the free spins bonus; if players collect five diamonds, a wild reel will be added to the game to help further boost winning potential. A win multiplier of 2x or more can also be in effect here.
Mermaids Diamonds Slot Summary
Mermaids Diamonds slot is a solid and entertaining slots game with fun theming, crisp graphics, and a range of features including the more unusual Divine Intervention bonus.
Structure and Mechanics
Even though the reel layout is unusual, the base game is logically structured: bet, spin, and match symbols. The mermaid wilds increase players’ chances of landing winning combinations, and the higher-paying mermaid and pearl symbols are easy to spot.
Numbers
The RTP in Mermaids Diamonds slot is 96.5%, while the volatility is medium.
As with many slots, most bigger wins stem from the bonus rounds, including Trident and Divine Intervention.
Disclaimer: Mermaids Diamonds trademark / license is owned by Play N Go. This site is not endorsed by Play N Go.
| Slot Name: | Mermaids Diamonds |
|---|---|
| Software: | Play N Go |
| RTP: | 96.50% |
| Volatility: | Medium volatility |
| Paylines: | 720 |
| Reels: | 5 |
| Min Bet (all lines covered): | £20.00 (GBP) |
| Max Bet: | £100 (GBP) |
| Top Win: | 5000 |
| Features: | Wild Symbol, Scatter Symbol, Free Spins, Medium volatility, 5 Reels |
| Themes: | Mythology, Fantasy, Sea life |
| Last Update: | 09/03/2026 |
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Yes. Play N Go have a UKGC license and are allowed to offer their games at UK licensed casinos. |
Mermaids Diamonds FAQs
What is the RTP of Mermaids Diamonds?
The RTP offered by the Mermaids Diamonds slot is nicely above average at 96.5%. This means that the game pays out £96.50 for every £100 staked by gamers, although individual returns may vary. Any of the game’s bigger wins are likely to come from one of the game’s three main bonus features: free spins, Divine Intervention, or Trident.
What is the volatility in Mermaids Diamonds?
The developer of Mermaids Diamonds has described the game as having medium volatility. This tends to mean that large wins are pretty rare, but there is a better chance of moderate wins on a not-too-infrequent basis. The maximum win potential in Mermaids Diamonds slot is 5,000x the bet placed.
Are there any bonuses in Mermaids Diamonds?
Yes, there are three main bonus features in Mermaids Diamonds: Trident, which can add extra wilds to spins to boost potential payout; free spins, which are triggered by the treasure chest scatter; and mermaid wilds, which help to form winning combinations of symbols in the base game.
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