Slot guide
Gems Bonanza slot review: tumbles, modifiers and Gold Fever
Pragmatic Play's 2020 cluster-pays gem slot, where wins on marked spots trigger modifiers and a progressive bonus builds multipliers.
The Gems Bonanza slot is Pragmatic Play's cluster-pays game from 29 October 2020, played on an 8x8 grid with tumbling wins. Winning on marked spots triggers one of five random modifiers, and the Gold Fever Progressive bonus builds multipliers of up to 10x. The listed RTP is 96.51%, volatility is high and the top win is 10,000x the stake. The bonus buy offered in other markets is not available to UK players.
Gems Bonanza: spec sheet
From the provider's published game sheet.
- Provider
- Pragmatic Play
- RTP
- 96.51%
- Volatility
- High
- Max win
- 10,000x stake
- Reels
- 8
- Rows
- 8
- Ways
- Cluster pays
- Released
- 29 October 2020
Features
- Tumble feature
- Five random modifiers triggered by wins on marked spots
- Gold Fever Progressive bonus with multipliers up to 10x
- Bonus buy - Bonus buy is not available to UK players
RTP can be set lower by some casinos; the game's own help screen shows the figure that applies. 18+ only.
Gems Bonanza cluster pays and tumbles
Clusters of matching gems that touch horizontally or vertically pay, then vanish so new gems can tumble in from above. One spin can therefore deliver a series of wins. The large 8x8 grid means many possible clusters, but also many spins where nothing connects.
Marked spots and the five modifiers
Some grid positions are marked. When a win lands on top of a marked spot, it triggers one of five modifiers, chosen at random, which alter the grid. The modifiers are the base game's main source of larger results, and they are where most of the game's variety comes from.
The Gold Fever Progressive bonus
The Gold Fever Progressive bonus is the feature round. Its multipliers build as it runs, up to 10x, so the later part of a good round is worth more than the start. In Great Britain it has to be triggered in normal play, because the option to buy it is not available to UK players.
Playing Gems Bonanza for real money in the UK
Real-money play needs an account at a GB-licensed casino, with age and identity checks completed before you deposit. Several licensed casinos name Pragmatic Play among their providers; they appear beside this review. Search by title, then open the game's information screen to confirm the RTP of the build on offer. Online slots at GB-licensed casinos are capped at £5 per spin, or £2 if you are 18 to 24, and every spin lasts at least 2.5 seconds; the slot stake limits guide has the detail. High volatility means a session can run well below or above the RTP, so decide your budget first.
Gems Bonanza, Gem Bonanza and other near-names
Pragmatic Play's catalogue has similar titles, including Gem Bonanza and Gems of Serengeti. They are different games, so check the full name on the tile before relying on the figures here. For another large cluster grid, see Jammin' Jars, or the studio overview on the Pragmatic Play page. No demo is embedded on this site; licensed casinos may offer one after age verification.
18+ only. See the responsible gambling page for deposit limits and help.
UK-licensed casinos, ranked by our score
Order = score out of 10. Every operator holds a Gambling Commission licence.
| # | Casino | Score | Welcome offer and significant terms | Payments | Links |
|---|---|---|---|---|---|
| Place 1 |  Bella CasinoRank Interactive (Gibraltar) Limited | Score: 7.9 out of 10, good | 100 bonus spins on Kong 3 Even Bigger Bonus when you deposit and stake £10 Significant terms New players; min deposit £10 (Paysafecard excluded) and £10 stake on Kong 3 Even Bigger Bonus; 10x wagering; max win £200 |
| Visit Bella Casino (opens the operator site in a new tab)Read the review: Bella Casino |
| Place 2 |  666 CasinoJupiter Gaming Limited | Score: 7.8 out of 10, good | 20 spins on Big Bass Splash when you deposit and wager £20 Significant terms 18+, new players, first deposit; £20 must be wagered on Big Bass Splash within 7 days; spins on Big Bass Splash; 0x wagering on winnings | Not listed | Visit 666 Casino (opens the operator site in a new tab)Read the review: 666 Casino |
| Place 3 |  Amazon SlotsJumpman Gaming Limited | Score: 7.7 out of 10, good | Chance to win up to 500 bonus spins on Starburst Significant terms 18+, new players, £10 min fund; bonus spins winnings subject to 10x wagering; max bonus conversion equal to lifetime deposits up to £250; only bonus wagers count |
| Visit Amazon Slots (opens the operator site in a new tab)Read the review: Amazon Slots |
| Place 4 |  Pub CasinoL & L Europe Limited | Score: 7.4 out of 10, good | 50 cash spins on Octobeer Fortunes after depositing and wagering £10 Significant terms Deposit and wager £10; activate before depositing; spins £0.20 each, winnings paid as cash, no max cash out; Skrill deposits excluded; spins expire in 48 hours |
| Visit Pub Casino (opens the operator site in a new tab)Read the review: Pub Casino |
| Place 5 |  LuckyMateAnakatech Interactive Limited | Score: 7.4 out of 10, good | 50 bonus spins on Big Bass Splash when you bet £10 on slots Code MATE50 Significant terms £10 min deposit; £10 in slot bets; 50 spins at £0.10 (£5 total); x1 wagering, £1 max bet contribution; £100 max cashout from winnings; 7-day expiry; selected payment methods only | Not listed | Visit LuckyMate (opens the operator site in a new tab)Read the review: LuckyMate |
| Place 6 |  HollywoodbetsHollywoodbets International UK Limited | Score: 7.3 out of 10, good | No welcome offer listed in the terms we read. | Not listed | Visit Hollywoodbets (opens the operator site in a new tab)Read the review: Hollywoodbets |
Ad We may earn a commission if you open an account through links on this page; it does not change our scores or the order of operators. How we score · Advertising disclosure
Questions readers ask
Can I buy the bonus in Gems Bonanza in the UK?
No. The bonus buy is not available to UK players, so the Gold Fever Progressive bonus must be triggered in normal play.
What is the RTP of Gems Bonanza?
The listed RTP is 96.51% with high volatility. Check the in-game information for the build your casino runs.
How are the modifiers triggered?
A win landing on a marked spot triggers one of five random modifiers.
Is Gems Bonanza the same as Gem Bonanza?
No. They are separate Pragmatic Play games with different features and figures.