Mermaid’s Diamonds Slot Machine

Swim to the deepest depths of the ocean and see what hidden treasures lay underneath the undertows. But, can you hold your breath long enough to find the jackpot prize?

Mermaid’s Diamond Slots is a medium variant ocean and mythological based theme slots game which consists of 270 paylines and 5 reels and is powered by PlayNGo software with a jackpot of £7200, the mermaid based game bonus features include Trident Wild symbol and the Divine Intervention Feature.

We, humans, have very limited capabilities when it comes to diving deep. So, why not enlist the help of a beautiful siren? Swim through the ocean floor and learn how the mermaid can amass the sea’s hidden wins when you read this Mermaid’s Diamond Slot Review.

Mermaid’s Diamonds Slot Sites with Free Spins

From our research, we have created a list of Mermaid’s Diamonds Sites in September 2023 that all boast free spins when you join. Capitalise on the latest welcome bonuses and enjoy free spins as we help you find an exclusive bonus:

  • PlayOJO Casino

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    Play Ojo is one of the top slot site in the UK and they’re now offering 80 no wagering free spins, play for free and keep what you win.

    First deposit only. 50 Free Spins on Book of Dead slot. Free Spin valued at £0.10. OJO’s Rewards and Game Play policy applies.

    Full T&C's Apply

  • Mr Green Casino

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    100 FREE SPINS
    Mr Green is a distinctive site with a prestigious design and a catalogue full of casino games and slots. Join and land their latest promo.

    18+. Play Safe. New customers only. Opt in required. 1x per customer. Min. £10 stake. Max. 100 Free Spins at £0.10/spin on Big Bass Bonanza only. Bonus expires 72 hours after issue. Game weighting, game, country, currency, player restrictions and terms apply. #ad

    Full T&C's Apply

  • Sun Bingo

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    The Sun Bingo specialises in bingo but they also have slot games and are offering 50 free spins on slots.

    Until 31/12/21. New customers only. 18+ Deposit & spend £10 on Bingo to receive £50 Bingo Bonus & 50 Free Spins (selected slots only 20p per spin). Free Spins must be accepted within 48 hours, winnings have 30x wagering which must be wagered within this time. Bingo Bonus has 4x Wagering, bonus must be accepted & wagered within 7 days. 1 new player offer only. Deposits made with Neteller/Skrill/PayPal are not valid for this promotion. UK & ROI. Full T&Cs apply. Please play responsibly.

    Full T&C's Apply

Mermaid’s Diamonds Slot Machine

Mermaid’s Diamonds Free Spins Promotions

Mermaid’s Diamonds Slot can be enjoyed for free, yet you still get the chance to land a real money prize. Use our help to find the best free spin welcome promotions. These promotions allow you to check out the gameplay for free and you can still win cash.

Find no wagering free spins and other free spin slots – you will be able to withdraw winnings. Check the wagering requirements before joining a promotion and find out how much you must stake before being eligible to withdraw into your bank account.

You will find the following free spins:

About Mermaid’s Diamonds Slot Game

Under the sea is where all the colourful, vibrant, and rare treasures lay – treasures like diamonds, rubies, emeralds, and sapphires that have fallen onto the ocean floor through countless shipwrecks. The ocean claims everything beautiful, much like the mermaids – maidens who wander the sea, luring in sailors and players alike to dive down deep and seek hidden gems. The symbols includes gems, manta-rays,, diamond symbols and a starfish.

This underwater-themed slot machine comes with 720 paylines in the game and 5-reels. It even offers a jackpot prize of 500,000 coins. Enjoy the list of wilds scatters and the free spins round. Just the visual aspect of this game is intriguing, it comes with lots of features too with a wild reel, scatters that are treasure chest symbols and more. You will hear plenty of sound effects with a serious and orchestral soundtrack.

To lure you even deeper into the sea’s depths, Play ‘n GO gives players the chance to win additional wilds thanks to the Trident Wilds feature, as well as an unlimited amount of free spins as these depend on the treasure chests chosen by the players.

So, if you’re up to dive down deep for some watery wins, then flip your tails and see just how many prizes your fins can lead you to.

How to Play Mermaid’s Diamonds Slot Online

Here are a few tips and tricks to remember when playing with the mermaid:

Click the (+/-) buttons to modify the number and value of coins to bet per spin. Then you can click the Spin button to begin the game.

Venture into the corners of the seven seas when you play the game from any mobile (Apple or Android), tablet, or PC/ Desktop device.

Slot Info

Mermaid’s Diamonds SlotsAttributes

Casino Game:

Mermaid’s Diamond Slots


720 line slots


5 reel casino slots 


Play N Go Games

Minimum Bet:


Max Bet:



Medium Variance Slots




Slot Theme: 

Mermaids, Sea Life, Fantasy and Mythology

Bonus Features:

Trident Wilds

Divine Intervention

Free Spins

Max Win:


Free Spins:


Release Date:

1st September 2017

Interactive Features

Make the most of the different bonuses with the free spins feature, wild symbols and scatters. Here are the Mermaid’s Diamonds Slot bonus games:

  • Wilds. There are two types of wilds in this video slot, the regular wild and the trident wild. Either wild is represented by the mermaid.
  • Regular Wilds. The mermaid wild symbol and can either become an expanding wild or come as a single or double symbol on the reels. This symbol can replace all other symbols apart from the scatter.
  • Trident Wilds. For this feature, the game randomly adds as many as two wilds to the reels to increase the possibility of landing a winning combination.
  • Scatter and Free Spins. The treasure chest represents the scatter symbol. To trigger the free spins bonus, players will need to land one treasure chest scatter symbol on each reel.

What Symbol Triggers Mermaid’s Diamonds Slot Bonus Free Spins Round?

Land three treasure chest scatter symbols on the reels and you will activate the free spins round with anything from 10 to 25 free spins.

These free spins are different from welcome promotions and instead they’re bonus spins that can be activated during the base game. This bonus feature you will be able to collect diamonds, every time you land five diamonds on a screen you will win a wild, this expanding wild will cover the entire reel and make it easier to land wins and big wins.

Paylines and Stakes

Who knew it only took 0.20 to 100 coins per spin to explore the seven seas? Well, thanks to Play ‘n GO, players can now spin and get a chance to win the 500,000 jackpot prize along with the countless symbol payouts and bonus prizes that this video slot has to offer.

While the jackpot does take time to land, players can keep their eyes out for the high and low paying symbols.

The gems hold more value than the sea creatures, so they act as the higher paying symbols. By landing 3 to 5 of these on the reels, players can win anything between 0.32 to 16 coins. While landing 3 to 5 of the stingray, starfish, cuttlefish, and conch shell can bring players a minimum of 0.16 and a maximum of 1.20 coins.

Mermaid’s Diamonds Slot Game Software

Mermaid’s Diamonds is a slot game that was made possible by Play’n GO.

Play’n GO is world-renowned, and they are known for implementing more modern technology into their games to make better gaming solutions for the future.

What is Mermaid’s Diamonds Slot’s RTP?

Mermaid’s Diamonds is a non-progressive slot game that has an RTP of 96.5%. 

This game has an excellent Return to Player rate. So, with this kind of payout percentage, players can get a return average of £96 per £100 bet.

Slot Volatility

This online slot is a medium variance game.

A medium volatility slot game ensures regular wins and you also get the chance to land some big wins too. This is the perfect fusion of quality and quantity, especially when you combine that with the generous payout percentage.


Anything is possible under the sea, and according to Sebastian, the crab, “everything is better down where it’s wetter”. That rings true in this casino slot game as players have over 720 ways to win here and there are an infinite amount of free spins to be won.

So really, diving down to the ocean’s murky depths isn’t so bad when you have that many prizes to look out for. Now, as fun as this slot’s gaming experience may be, it may be better suited for those players who have a bit more experience playing this kind of game. That’s because it does take a little longer to land substantial amounts. But, despite this challenge, this video slot is refreshing, really intriguing, and quite a sight to behold. So, if you’re a fan of mermaids or underwater fun, then this is one slot game you wouldn’t want to sail past.

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A freelance writer who loves to research all areas of online casinos. As a Journalism Graduate, I enjoy copywriting and reviewing all the latest slot machine games released. With many iGaming articles published in Birmingham Mail, Manchester Evening News & Daily Mail. Currently working remote and enjoying the freedom.