Quick answer
Gemstone Jam is a Yggdrasil slot (2026) with 96% RTP and very high volatility. It uses 9 paylines with wild symbols. An official free demo is available. RTP can vary by casino.
Key specs
- RTP
- 96%
- Volatility
- Very high
- Hit frequency
- 30% (about 1 in 3.3 spins)
- Grid
- 3×3
- Pays
- 9 paylines
- Released
- 28 April 2026
- Bet range
- $0.10–$10
Not published by the provider: max win, jackpot
Casinos with Yggdrasil games
- Lunaro100% up to $300 + 100 Free Spins25x bonusCarries YggdrasilPlay at Lunaro (opens in new tab)
18+. New customers. Min dep $10. 25x bonus wagering. Max bet $5. 30 days. 100 spins on Gates of Olympus at $0.20. Full T&Cs apply.
Key terms
18+. New customers only. Min deposit $10. 25x bonus wagering requirement. Max bet $5 while wagering. Free spins on Gates of Olympus at $0.20 per spin. Offer valid 30 days. Full T&Cs apply. Please gamble responsibly.
Check Gemstone Jam is in the lobby in your country.
Themes:
Free demo Members
Try Gemstone Jam with play money before deciding whether to play for real. Official Yggdrasil demos are free for GambGenius members.
How to play Gemstone Jam (members only)
Wins are paid when matching symbols land on an active payline, usually left to right starting from the leftmost reel. Your total stake is spread across the lines, and each line win is the line bet multiplied by the symbol's paytable value.
Gemstone Jam is played on a 3×3 grid with 9 paylines.
- Set your stake. Choose your total bet per spin between $0.10 and $10. Wins are paid as multiples of this stake.
- Check the paytable. Open the game's info screen to see what each symbol pays and the exact rules for this version.
- Spin. Each spin's result is decided by a certified random number generator, independent of previous spins.
The full Gemstone Jam guide: how winnings work, 1 feature and 4 strategy tips
- Your stake plan: a $50 budget → about $0.12 a spin (very high volatility)
- What 96% RTP costs per $100 wagered: $4.00 on average
- 1 feature explained: wild symbols
- Stake plans for $20 to $250 budgets, checked against the $0.10 minimum bet
- 4 RTP versions compared: 96%, 94%, 92%, 90.5%
- 4 slots with the same style and a higher RTP (up to 99%)
- Strategy tips and a session planner for Gemstone Jam
Free · no card · 18+ only
Never sold · export or delete any time · What do members get?
How winnings work (members only)
What 96% RTP costs per $100 wagered
What 96% RTP means
Expected return = stake × 96%
Over $100 of total bets, the long-run average loss is $4.00
RTP is a long-run average across millions of spins. Any single session can finish far above or below it, especially on a very high volatility game.
The published hit frequency is 30%, meaning roughly one spin in 3.3 returns something — though many of those wins are smaller than the stake.
Features explained (members only)
1 feature explained: wild symbols
Wild symbols
Wilds substitute for regular paying symbols to help complete winning combinations. They do not normally replace scatter or bonus symbols.
Strategy tips (members only)
- Size your stake to the volatility. Very high volatility means most spins lose and a large share of the return comes from rare big features. Treat it as entertainment with a strict budget and a stake of around 0.5% of your session budget or less. A simple rule: bring at least 400 spins' worth of budget, so a $50 budget suggests a stake of about $0.12.
3 more tips and a session planner
- Check which RTP version you're playing. Yggdrasil offers this game at 96%, 94%, 92%, 90.5%. Open the game rules at your casino and prefer sites running the 96% version.
- Bonus wagering: at 96% RTP, clearing $1,000 of wagering costs about $40.00 on average. Check the bonus terms, as some casinos exclude specific games. Run your numbers in the wagering calculator.
- Set limits before you spin. Decide your loss limit and session time in advance and stop when you reach either. No pattern or betting system changes the outcome of a spin.
More on this in slot RTP and volatility explained and bankroll management.
Does it fit your budget? (members only)
Stake plans for $20 to $250 budgets, checked against the $0.10 minimum bet
For very high volatility we suggest a budget of at least 400 spins. This is what that means for Gemstone Jam (bets from $0.10 up to a maximum bet of $10).
| Budget | Stake a spin | Bet range | Average cost of 400 spins |
|---|---|---|---|
| $20 | $0.05 | Below the $0.10 minimum bet | $0.80 |
| $50 | $0.12 | Fits | $2 |
| $100 | $0.25 | Fits | $4 |
| $250 | $0.62 | Fits | $10 |
Averages only: a short session can end far above or below them. Set a loss limit before you play.
RTP versions (members only)
4 RTP versions compared: 96%, 94%, 92%, 90.5%
Yggdrasil supplies Gemstone Jam in 4 RTP versions and each casino chooses which one to run. Over $1,000 of bets, the 90.5% version costs about $55 more on average than the 96% version.
| Version | Average cost per $100 wagered | Extra vs best |
|---|---|---|
| 96% (best) | $4.00 | — |
| 94% | $6.00 | +$2 |
| 92% | $8.00 | +$4 |
| 90.5% | $9.50 | +$5.50 |
Open the game's rules or info screen at your casino to see which version it runs.
Seen a different version at a casino? How member RTP reports work
Same style, better RTP (members only)
4 slots with the same style and a higher RTP (up to 99%)
Slots with the same mechanic (paylines) and volatility (very high) as Gemstone Jam, with a higher published RTP. Casinos can still run lower versions of any of them.
Book of 9999% RTP · +3 pts
Revolvero98.11% RTP · +2.11 pts
Baba Yaga98% RTP · +2 pts
Battle The Beast98% RTP · +2 ptsQuestions
Frequently asked questions
Who makes Gemstone Jam?
Gemstone Jam is developed by Yggdrasil and was released in 2026.
What is the RTP of Gemstone Jam?
The default RTP of Gemstone Jam is 96%. Yggdrasil also supplies versions at 94%, 92%, 90.5%, so check the game's info screen at your casino.
Is Gemstone Jam high volatility?
Gemstone Jam is rated very high volatility. Very high volatility means most spins lose and a large share of the return comes from rare big features.
Can I play Gemstone Jam for free?
Yes. GambGenius members can play the official Yggdrasil demo of Gemstone Jam free on this page. It uses play money only, so demo wins can't be withdrawn, and it is for players aged 18 and over.
Does Gemstone Jam have a bonus buy?
No bonus buy is listed for Gemstone Jam in the sources we checked.
Where can I play Gemstone Jam?
Lunaro carries Yggdrasil games. Check Gemstone Jam is in the lobby in your country before you sign up. 18+ · New customers · T&Cs apply. Availability varies by country.
Where this data comes from
- yggdrasilgaming.com Provider
Specs are as published by the provider. Casinos can run lower-RTP versions, so always check the game rules before you play.
Game artwork © Yggdrasil, shown to identify the game.
