Prism of Gems

Prism of Gems Slot Review

Slot Provider: Play n Go

RTP: 96.24% | Variance: High | Maximum Win: 30,000x

Our Score: 8.4

Play at Casumo Casino

WHY YOU CAN TRUST THIS REVIEW: The information and opinions on this page are the result of an comprehensive process of information gathering and live game testing by the gambling experts who work at Find out more here.

About Prism of Gems

Reviewed by:

Published Date: 26th July 2021

How We Review Slot Games

We test and rate all slot games across 5 criteria, assigning a score out of 10 for each and an overall score that is an average of the 5. To build an accurate assessment of each game we gather information from the supplier and play in real play or demo mode. Find out more.

Prism of Gems from Play n Go is a 5 reel gemstone slot which mixes multiplier reels, cascading wins and splitting cells with exciting results. Multipliers in an independent 3×1 reel above the main set progress to as high as 7x when cascades occur beneath. Where symbols in the Multiplier reel match those on the main reel set then splits occur too. This can create up to 7 rows per reel and boost paylines as high at 3,087 per spin. The free spins round is super-charged as multipliers no longer re-set between spins.

Prims of Gems has a stunning 30,000x max win and spins start at 20p.

Prism of Gems Game Information

  • RTP: 96.24% | 94.25% | 91.24% | 87.25% | 84.25%
  • Variance: High
  • Maximum Win: 30,000x
  • Progressive Jackpot: No
  • Reels: 5
  • Rows: Up To 7
  • Paylines: Up To 3,087
  • Minimum Stake: £0.20
  • Theme: Gems
  • Features: Cascading Wins, Splitting Symbols, Multipliers, Free Spins, Progressive Multipliers

Testing Notes: Here’s What Happened When We Played Prism of Gems

IMPORTANT: To give you an accurate assessment of the games we review our writers play 200 spins. Whilst this is a useful tool to help us review games and to give an example of what might happen when you play, keep in mind that 200 spins is only a very small sample and cannot be used to accurately predict what might happen over another 200 spins. The outcome of all slots play is always random.

Boom Or Bust? Our Session By The Numbers

I played 200 spins on Prism of Gems for real money at Casumo Casino to test the game and this is what happened.

  • Stake Size: £0.2
  • Start balance: £32.38
  • End balance: £38.52
  • Biggest Win: 37.3x
  • Free Spins: 0
  • Session Time: 15 minutes 27 seconds

This is a game that clearly has lots and lots of potential but it’s a real tease as I found out in 200 spins. I never came close to the free spins round which is not that unusual – some games take 250, even 500 spins, to trigger. But there were of course many cascades and watching the multipliers build is fun, but frustrating when they run out of steam too.

Prism of Gems win with green gems
2 lines of green gems trigger a win
Prism of Gems 37.3x win
A 37.3x win from 3 cascades in testing

The biggest win I hit was a 37.3x triggered with 2x, 3x and 3x multipliers on reels 2, 3 and 4 respectively after 3 cascades including 2 lines of green gems. You can see all that on the screenshots above. It’s not a huge win but it’s the kind that gives you a small glimpse of what can happen when you start building sequence of Cascades and boost up those multipliers.

What We Liked

  • Cool system to trigger splitting cells
  • Multipliers progress up to 343x per spin
  • Massive 30,000x top payout
  • Orante and eye catching design
  • Unlimited free spins

What We Didn't like

  • Very volatile so tough to unlock bonuses

Prism of Gems Review Scores

  • Theme and Design 8
  • RTP and Variance 8
  • Maximum Win 9
  • Symbols and Paytable 8
  • Features and Gameplay 9

What Our Reviewer Says ...

"A classic high variance gem slot that can deliver in a big, big way thanks to a volatile combination of cumulative multipliers and splitting cells!"

Overall Score: 8.4

Theme & Design

Our Score 8

An Ornate and Grandiose Slot Design

Prism of Gems doesn’t blow you away with its production but it does have a certain charm to it. For whatever reason the game is housed in a glass-domed building that could be a museum of some kind. Maybe this reel set is the main attraction with its stunning collection of gem treasures?! Who knows?

Prism of Gems Slot by Play n Go
Prims of Gems’ ornate design

The reels themselves have an ornate look with green gilded iron framework and a sort of marble background to the pay symbols whilst the gems shimmer from time to time and the scatter is like a giant round stain glass affair. It feels like Play n Go have given this one a grandiose-r atmosphere than the previous Gems games, perhaps to reflect the much-enhanced potential.

RTP and Variance

Our Score 8

What is RTP?

RTP (Return to Player) refers to the amount a game will pay out in cash prizes expressed as a percentage of all the money wagered on that game. For example, a 96% RTP means a game will pay out £96 for every £100 wagered. This is an average number and will vary from one session to the next.  Read more here.

What is Variance?

Variance refers to how far a game will deviate from its RTP over time. High variance games deviate a lot and produce uneven win distributions and unexpected windfalls. Low variance games provide a more stable and even distribution of wins. Read more here.

Prism of Gems has 5 RTP settings – 96.24%, 94.25%, 91.24%, 87.25% and 84.25%. This is typical for Play n Go games. It’s worth checking the info screen in the game to be sure that you are playing at a reasonable setting before you spend any more. 96.24% or 94.25% are most common and I wouldn’t play at less. I checked 5 top slot sites that we regularly use to test games to see which setting Prism of Gems runs on.

Prism of Gems is also a high volatility slot with a very high potential payout. What does this mean? Where win distribution is concerned, its unpredictable in nature, but combinations of win cascades and multipliers in the bonus round can be spectacular.

Maximum Win

Our Score 9

What Is Maximum Win?

Maximum win refers to the maximum amount a player can win from one spin. It is expressed as a multiple of the stake. For example, where the maximum win is 100,000x, from a £1 stake, the maximum win would be £100,000.  

The top payout in Prims of Gems is 30,000x. That makes it one of Play n Go’s highest paying slots, up there with Raging Rex 2 (30,000x) and Clash of Camelot (35,000x). A good slot for those who like to have an epic win in their sights.

Explore Games With Similar RTP, Variance and Maximum Win

Like the numbers? Here are some more games you might want to try.

Slot SiteSupplierRTPVarianceTop Payout
Clash of CamelotPlay n Go96.28%High35,000xPlay Here
Raging Rex 2Play n Go96.2%Medium30,000xPlay Here
The Last SundownPlay n Go96.2%High36,000xPlay Here
Dr ToonzPlay n Go96.25%High22,000xPlay Here
Kiss Reels of RockPlay n Go96.2%High50,000xPlay Here
Merlin and the Ice Queen MorganaPlay n Go96.2%High20,000xPlay Here
Hugo CartsPlay n Go96.23%High25,000xPlay Here
Wild YieldRelax Gaming96.12%High50,000xPlay Here

Symbols and Paytable

Our Score 8

I like the interesting set up in this game.

Let’s start by saying that it is a win ways slot. That means wins are triggered by landing identical symbols on adjacent reels from from left to right regardless of the row they are on.

There are 5 reels in total, built in a pyramid-shape with 3 rows on the outermost reels and 4 on the 3 middle reels. That gives you 576 win ways (3x4x4x4x3). But that can change. The top row on the middle 3 performs a special function that can trigger symbol splits to create up to 7 rows on these reels. At that point, the win ways increase to 3,087 (3x7x7x7x3).

Prism of Gems Paytable
Paytable paying up to 5x for 3 blue gems

Symbol values themselves are not huge, but there is a lot in the form of multipliers, plus the expanding reels, to power up your wins, so don’t be put off.

Low payers are the cards, 9 though to Ace. They are valued at from 0.1x for 3 9s up to 0.7x for 5 Aces. The premiums are the four colored gemstones themselves – pink, green, yellow, blue – that pay out from 0.5x for 3 pinks up to 3x for 5 blues.

There is also a Wild icon which substitutes for all other symbols except the scatter to form wins.

Features and Gameplay

Our Score 9

Cascading Wins, Multiplier Reels and Progressive Multipliers

At the heart of all the action in Prism of Gems are Win Cascades. These occur whenever there is a win. Winning symbols are removed and new ones drop in to replace them. This can trigger more wins, causing the process to repeat. And so on, until no more wins occur.

The clever part about this game is that Play n Go have found a new way to build multipliers in response to Cascading Wins helped by a split reel set effect where the extra row on reels 2, 3 and 4 is a 3×1 reel that spins horizontally rather than vertically. This is called the Multiplier Reel. It spins first and settles to display a pay symbol with a multiplier value in each position.

Multipliers on reels 2, 3 and 4 in Prism of Gems
Multipliers increase to 2x on the Multiplier Reels

When the main reels settle, if a Cascade occurs on reels 2, 3 or 4 then the multiplier on the corresponding Multiplier Reel above increases by 1x. So if reel 2 cascades then the multiplier on reel 2 on the Multiplier reel will increase by 1x.

Multipliers can keep increasing until they reach 7x and they apply to any win that includes the symbol from the Multiplier Reel. And the best part? They multiply together when more than one is part of a win. That can create multipliers of up to 343x (7x7x7).

Splitting Cells on Reel 3
2 10s on reel 3 from a splitting cell

But that is not the only function of the Multiplier Reel. If a symbol landing on reels 2, 3 or 4 matches the one in the multiplier reel above then it automatically splits into 2. That can turn the 3 rows into 6. Or better still, if a wild lands on the Multiplier Reel then all the symbols that land below split into two.

Free Spins Round Where Multiplier Do NOT Re-Set 

If you are wondering how you get anywhere near that 30,000x win, here is a big clue!

The Free Spins round is triggered by landing 3, 4, or 5 scatters anywhere on the reels on one spin. This gives you 10, 15, or 20 free spins, respectively. Any multipliers active on the horizontal reel at this point are carried into the bonus round. But more importantly, during the free spins the multipliers do not re-set between spins – they are cumulative. And, any additional scatters that land will collect you a further 2 free spins without limit.

So, if luck is on your side there is a real chance of building all 3 multipliers up to the full 7x value.

The Final Verdict

Prism of Gems is a slot perfectly designed for high variance fans who enjoy chasing down huge wins. The key elements of the gameplay – Cascading Wins, Progressive Multipliers and Splitting Cells – have been combined in a sophisticated fashion to make this slot into a really exciting experience. The appeal is in watching the Multiplier Reel reveal its chosen symbols first before seeing if they are matched beneath for splits, as well as seeing the Cascades unfold to boost your multipliers. There is a definite rhythm to the game that you get into as you play it, but I should warn you that it teases more than it delivers! What I am absolutely certain of is Prism of Gems power to deliver big wins. It’s all there in the clever feature configuration with persistent multipliers and unlimited free spins re-triggers. Now it’s over to you … time to see how far you can take it.

Compare Prism of Gems With Similar Slots Picked By Us

Here are more games like Prism of Gems compared on configuration and features. Click through to read a review of each one.

Slot GameProviderThemeMin. StakeMax. RTPVariancePaylinesTop PayoutJackpot
Just For The WinWild West£0.2096.15%High5025,000xNo
Just For The WinWild West£0.2096.09%High2525,000xNo
ELK StudiosSweets£0.2094%Medium-HighUp to 262,14425,000xNo
ELK StudiosArthurian Legends£0.2094%HighUp to 262,14425,000xNo
Play n GoFuturistic£0.1096.2%HighUp to 7,77636,000xNo
Nolimit CityCars£0.2096.03%High99 to 25936,000xNo
Nolimit CityAncient Greece£0.2096.04%High72 +31,000xNo
Nolimit CityOriental£0.2096.1%HighUp To 12,28830,000xNo

Useful Tips When Playing Prism of Gems

Remember, online slots are games of chance, there is NO strategy that can improve your odds of winning. However, reading our review and following these tips will help you get the most out of your time playing this slot game.

1. Play In Demo Mode First

With a slot like this its always better to road test in demo mode first. Understanding the interaction of the Multiplier Reel and Cascades is important or the game will pass you by.

2. Start With A Low Stake

This is a highly volatile slot and it can burn your balance fast. Setting a low stake – consider the 20p minimum – can help you to make your money go further.


3. Watch The Multiplier Reel First

Keep an eye on the Multiplier Reel coming in first. Then look for the symbols that appear there to appear again in the middle 3 reels underneath. Matching them causes splits which increases the win ways.

4. Always Play At Licensed UK Slot Sites

Only play at licensed slot sites that are regulated by the UK Gambling Commission. These are audited to ensure that they only offer fair, safe and secure play.

Who Made Prism of Gems?

  • Name: Play n Go
  • Established: 1997
  • UK License: Remote 021725-R-304911-020
  • Total Games: 200 +
  • Known For: Grid slots, high variance slots, huge range of themes, styles and maths models
  • Popular Slots: Book of Dead, Reactoonz 1 and 2, Troll Hunters 2, Rise of Olympus
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