All casinos featured on Bojoko are our partners with valid gambling licenses. Ad Disclosure
All casinos on Bojoko are our partners with valid gambling licenses. Ad Disclosure

Gemtastic slot review

Added by Red Tiger. Information last updated: 20/05/2020

User rating:

- (0)

Tester rating:

3.3 (1)

Game information

Game supplier:Red Tiger

Release date:01/2019



Max. win:bet x 10000

Mobile version:Support all devices

Play Gemtastic



Colossal symbols





Riches & luxury


User ratings (0)

Game design:



Game sounds:

Mobile gaming:


RTP (Return to player):
Max. win:
bet x 10000

Bojoko score (compared to other slots on Bojoko)
Red Tiger score (compared to other slots of supplier)

Slot tester's review: Trystan Michielsen

Gemtastic brings us down into the depths of an ancient giant cavern filled with gems and tasks us with finding the best and biggest combinations. Beautiful gems adorn this playing field while multipliers and re-spins dominate the gameplay.

The game has a 6-reel, 5-row playing field with a total of 30 paylines which might seem low compared to the larger screen. However, the addition of cascading reels means that players will get multiple opportunities to collect wins. The game was developed and released in 2019 by Red Tiger.

I thought the game looked acceptable considering the limited possibilities coupled with the setting. The cave in the background looked vast and mysterious, steeped in dark blues with the shine of gems stuck in the rocks. Meanwhile, the reels were filled with simple but colourful gems that looked different enough to easily differentiate.

Gemtastic doesn’t get away from the base game, incorporating all features into the main screen and offering no distractions in the form of free spins or a bonus game. This was not a detriment, in my opinion, considering the features are interesting and obvious enough to fit into the base game.

The sound in this slot is space-sounding with a lot of electronic beeping and jingling. Wins are emphasised by a loud and ramping beat that makes it a little too obvious you got a win. Considering the cascading feature it can also become quite overbearing.


All of the symbols in Gemtastic are different variations of gems. There are quite a few of them, resulting in the High Volatility it is listed as. That doesn’t mean wins are necessarily spaced out a lot, but a single winning payline is not enough to compensate for the cost of a spin. The game very much depends on multiple winning paylines in a row, coupled with the ever-increasing multiplier. If you don’t get those together, the wins are going to be too low.

The symbols are from highest to lowest:

  • Wilds: A random gem can sparkle. If that gem is part of a win it will turn into a Wild. Wilds substitute all other gems in the game. Max. 1,500x your bet with six-of-a-kind on a winning betline.
  • Orange Gem: Max. 240x your bet with six-of-a-kind on a winning betline.
  • Green Gem: Max. 150x your bet with six-of-a-kind on a winning betline.
  • Red Gem: Max. 120x your bet with six-of-a-kind on a winning betline.
  • Pink Gem: Max. 90x your bet with six-of-a-kind on a winning betline.
  • Yellow Gem: Max. 48x your bet with six-of-a-kind on a winning betline.
  • Orange Gem: Max. 42x your bet with six-of-a-kind on a winning betline.
  • Purple Gem: Max. 36x your bet with six-of-a-kind on a winning betline.
  • Blue Gem: Max. 30x your bet with six-of-a-kind on a winning betline.
  • Azure Gem: Max. 24x your bet with six-of-a-kind on a winning betline.


Gemtastic doesn’t have too many features but since they work together, it’s likely you’ll see these features activate almost every spin. This can result in a very big win or only a tiny win. This facilitates the high volatility, with high risk and high reward gameplay that’s only for players that enjoy this type of slot.

The features are:

  • Wilds: Wilds don’t appear regularly during the game but every spin certain gems have a coloured border around them. Whenever these gems are part of a win, they will add Wilds to the playing field on the re-spin.
  • Cascading Reels: Every time there is a win, the symbols involved disappear and are replaced by new symbols.
  • Re-Spins: Whenever there’s a win it triggers an automatic re-spin.
  • Multiplier: If there’s a win, the multiplier on the side of the screen increases. The multiplier can go up to 15x the win.
  • Colossal Symbols: Each of the symbols can appear in the shape of a 2x2 or 3x3 colossal symbol.

In Gemtastic, every spin is basically its own game. In the best-case scenario, a single spin will result in a dozen re-spins, increasing the multiplier with every re-spin and creating bigger and bigger wins. In reality, this will only happen very rarely.

During my time playing a single win per spin was quite likely. The multiplier would increase to 2x, a re-spin was triggered and that was it. There was no second win, the multiplier would reset and the game would spin as normal. This could happen multiple times in a row, or there would be no win at all.

If we take this as the standard gameplay over a longer time it should become clear why the game has high volatility. There aren’t enough regular wins to compensate the spending required to keep the wheels spinning. As a player, you become very dependent on the occasional times where the multiplier keeps increasing and the re-spins keep triggering wins. If that doesn’t happen, we see a steady decline in our funds.

I found that the colossal symbols don’t appear enough to be considered a part of the slot in any meaningful way. The 2x2 symbols might appear a little more often but since it requires at least 3 symbols to trigger a win, those are often not enough to do anything.

In Conclusion

Gemtastic is a simple but nice-looking slot which has embraced its setting fully. There are no card symbols here, everything is made out of gems. The gameplay has a very short loop that can result in some tremendous wins if the stars align but unfortunately they almost never do.

I had a good time playing but I had to stop because I simply ran out of coins. There was no real upward trend at any point and even big wins only helped to compensate for my losses. They didn’t put me in the positive. I find this game to be a slot for players that enjoy a relaxing if slightly modern gameplay experience, and aren’t overly concerned with big wins.

That said, the potential win is a massive 10,000x your bet so it is possible this might be a very beneficial slot. I would simply not expect it to pay out in any way even close to that maximum win.

Overall rating:


Play Gemtastic for free

Browse casinos with Gemtastic and other slots from Red Tiger. Create an account and try the game for free before making a deposit.

Casimba review »

Number of games: 600

1st deposit bonus: 200%/C$500 + 50 FS

Play here »

+18, new CA players only, be GambleAware | Full apply

21 Casino review »

Number of games: 1200

1st deposit bonus: 121%/C$300

Play here »

+18, new CA players only, be GambleAware | Full apply

666 Casino review »

Number of games: 700

1st deposit bonus: 100%/C$666 + 66 FS

Play here »

+18, new CA players only, be GambleAware | Full terms apply


Wins and bets

RTP (Return to Player):96%


Max. win:bet x 10000

Min. bet:C$0.1

Max. bet:C$10

Progressive jackpot:

Reels & playlines



Non-standard layout:

Max. lines:30

Min. lines:30

Win both ways:

Other features


Expanding reels:

Stacked symbols:

Colossal symbols

Auto play:

Turbo play:

Quick play:

Virtual reality:

Bonus features

Bonus game:

Random bonus:

Progressive bonus:

Buy bonus:

Free spins:

Scatter symbols:

Bonus game symbols:


Standard wilds:

Sticky wilds:

Walking wilds:

Stacked wilds:

Random wilds:

Multiplier wilds:



Walking re-spins:

Sticky re-spins:

Cascading reels:

Sticky wins:


You can play Gemtastic in English, Finnish, Swedish, German and 18 other languages.

All supported languages:
English, Finnish, Swedish, German, French, Spanish, Italian, Russian, Czech, Danish, Dutch, Hungarian, Polish, Norwegian, Portuguese, Slovak, Turkish, Chinese, Slovene, Korean, Japanese


Gemtastic supports GBP, EUR, USD, CAD


Release date 01/2019
51st newest on Red Tiger 658th newest on Bojoko
RTP 96% 0.14% > average
82nd highest on Red Tiger 1,207th highest on Bojoko
Win up to 10000 x your bet
5th highest on Red Tiger 316th highest on Bojoko
Paylines 30 50% > average
33rd highest on Red Tiger 543rd highest on Bojoko
Min bet C$0.1 per spin
The lowest on Red Tiger 480th lowest on Bojoko
Max bet C$10 per spin
119th highest on Red Tiger 1,953rd highest on Bojoko
Rated 0 by 0 members
2nd most rated on Red Tiger 38th most rated on Bojoko
137 more slots listed by Red Tiger

Similar slots

Esqueleto Mariachi RTP: 96.1% Max. lines: 40 Volatility: Medium
Ocean Fortune RTP: 96.3% Max. lines: 20 Volatility: Low
Phoenix RTP: 96.29% Max. lines: 40 Volatility: High

Slot tester's profile


Trystan Michielsen

Trystan Michielsen

I've been playing videoslots for almost 10 years and been a professional reviewer for over 5. I look at slots not just as a writer but also as a player, hoping to help others find their perfect slot.

I also enjoy movies, books and travel so any slots with those topics usually have my preference. But in general I'll play everything!

Latest reviews:
Gemtastic cover

Game supplier:Red Tiger

Release date:01/2019

RTP (Return to player):96%

Max. win:bet x 10000

Mobile version:Yes

User rating: 0
Tester rating: 3.3

User reviews

Sign in to review slots on Bojoko.

Say "yes" to the cookies. Learn more in our privacy policy.