Greentube

Diamond Mystery - 40 Charming 7's

Slots Video Slots Fruit Gems Star Classic

Classic Fruit entry in Greentube's Diamond Mystery series

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

95.48%

return to player

Volatility

—

variance

Max win

—

top multiplier

Min bet

$0.20

per spin

Reels

40 lines

Player rating

3.0 ★

8 votes

DEMO Play free, no signup

Greentube

Embed on your site

3.0 / 5

8 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP8/10

RTP 95.48% → 8.0/10

Volatility8/10imputed

imputed medium (unknown) → 8.0/10

Win Potential—

no data

Features2/10

4 features → 2.0/10

Game Mechanics4.2/10

f=4 r=5 p=40 → 4.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility6/10

0.2–40 (×200) → 6.0/10

Provider Reputation5.5/10

provider avg 5.5 → 5.5/10

Popularity0/10

synthetic proxy → 0.0/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 49 — Diamond Mystery - 40 Charming 7's by Greentube

https://slotranker.com/greentube/diamond-mystery-40-charming-7s#score

How to cite

Slot Summary

Five reels and 40 fixed lines frame Diamond Mystery - 40 Charming 7's as a Classic Fruit game, but the defining interruption comes after a non-winning spin. Greentube's Diamond Mystery feature can open a card-picking sequence tied to four Progressive Jackpot levels, shifting attention away from the ordinary line result. With a 95.48% RTP, the game extends its named series through jackpot selection rather than a large inventory of reel modifiers.

How It Plays

Regular combinations form from left to right across 40 fixed lines. Only the highest win on each active line is paid, while Scatter results are evaluated separately.

The Mystery event does not depend on assembling a reel trigger. It may interrupt a non-winning result and move play directly into the Jackpot card selection.

Theme & Atmosphere

Classic and Fruit define the base presentation through familiar symbols, keeping the ordinary line game immediately readable before the Mystery feature changes the format.

Gems and Star distinguish the special-symbol layer. Gem matches identify the Progressive Jackpot level, while the Star acts as the Scatter during standard reel play.

Fruit Gems Star Classic

Features & Win Potential

The Seven Wild substitutes for regular paying symbols but not the Scatter Symbol, helping complete left-to-right combinations across the game's fixed lines.

The Star Scatter pays independently of line position, separating its result from the ordinary combinations that must begin on the leftmost reel.

Scatter Symbol Wild Symbol Progressive Jackpot Mystery symbol

Bonus & Free Spins

The Mystery symbol feature can activate after a non-winning spin and reveal 12 face-down cards. Selection continues until three matching Gems identify one Progressive Jackpot level.

Four Progressive Jackpot levels are available, with the player's stake affecting the applicable award. The card-selection outcome is random rather than influenced by which cards are chosen.

Spec sheet

Diamond Mystery - 40 Charming 7's at a glance.

Identity

Slot nameDiamond Mystery - 40 Charming 7's

StudioGreentube

Released12/18/2024

Math

SlotRanker Score49

RTP95.48%

Max win—

Bet range$0.20 – $40.00

Player rating3.0 / 5 · 8 votes

Format

Reels5

Paylines40

Layout5x3

Features

Themes

Expected average based on this slot's 95.48% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$3.62

Cost per session$3.62

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Diamond Mystery - 40 Charming 7's? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: Mediumassumed — not published for this slot

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (Medium). The model is calibrated so the average return equals this slot's published RTP (95.48%), with wins capped at its top multiplier (1,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Diamond Mystery - 40 Charming 7's

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Compare Diamond Mystery - 40 Charming 7's with other games

	Diamond Mystery - 40 Charming 7's Score 49This game	777 Super BIG BuildUp Deluxe Score 83	2023 Hit Slot Score 81	Fever Spin Megaways Score 81	Jokrz Wild UltraNudge GigaBlox Score 81
Identity
Studio	Greentube	Crazy Tooth Studio	Endorphina	iSoftbet	Bang Bang Games
Released	12/18/2024	7/12/2022	3/15/2023	6/14/2024	6/15/2023
Math
RTP	95.48%	96.19%	96.01%	95.99%	96.1%
Volatility	—	High volatility	High volatility	High volatility	High volatility
Max win	—	15,000×	93,750×	50,000×	7,216×
Format
Reels	5	5	6	6	6
Layout	5x3	5x3	6x4	6x7	6x4
Paylines	40	576	4096	117649	4096
Min bet	0.2	0.15	0.4	0.2	0.2
Max bet	40	30	20	20	20
Features
Progressive	✓	—	—	—	—
Wild symbol	✓	✓	✓	—	✓
Free spins	—	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	—	✓
Multiplier	—	✓	—	—	✓
Bonus game	—	—	—	—	—
Respins	—	—	—	—	—

Every number is shown as a delta against Diamond Mystery - 40 Charming 7's.

Comparing against

Diamond Mystery - 40 Charming 7's

Greentube

RTP

95.48%

Max win

—

Score

777 Super BIG BuildUp Deluxe

+ Free Spins+ Multiplier− Progressive

+ Free Spins− Progressive

+ Free Spins− Progressive− Wild− Scatter

Jokrz Wild UltraNudge GigaBlox

+ Free Spins+ Multiplier− Progressive

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01How does the Diamond Mystery feature start?

It can trigger randomly after a non-winning spin, without requiring a specific Scatter combination on the reels.

02What happens in the Jackpot feature?

The player selects from 12 face-down cards until three matching Gem symbols reveal which of four Jackpot levels is awarded.

03What do the Wild and Scatter symbols do?

The Seven Wild substitutes for regular symbols, while the Star Scatter pays independently of its position on the fixed lines.

Series

Diamond Mystery

View all 13 games

Game	Year	RTP	Volatility	Slot Score
Diamond Mystery 40 Imperial CrownGreentube	2023	95.48%	Medium volatility	50
Diamond Mystery 10 Imperial Crown DeluxeGreentube	2023	95.48%	—	50
Diamond Mystery 20 Imperial Crown DeluxeGreentube	2023	95.48%	Medium volatility	53
Diamond Mystery 100 Imperial Crown DeluxeGreentube	2023	95.48%	—	51
Diamond Mystery Fruitilicious deluxeGreentube	2024	95.48%	Low/Medium	53
Diamond Mystery - 40 Imperial Crown deluxeGreentube	2024		—	40
Diamond Mystery Stars InfernoGreentube	2024	94.25%	Medium volatility	57
Diamond Mystery 100 Wild FireGreentube	2024	95.48%	—	55
Diamond Mystery Fortune StreaksGreentube	2024	95.48%	—	59
Diamond Mystery - 40 Charming 7'sCurrentGreentube	2024	95.48%	—	49
Diamond Mystery - Fruitful Frenzy - Cash AccumulatorGreentube	2025	95.48%	Medium volatility	56
Diamond Mystery - 100 Charming 7'sLatestGreentube	2025	95.48%	—	49
Diamond Mystery - 40 Charming 7's 6reelsGreentube	—		—	31