The moment a slot asks you to pay twice
You load a game, set your stake, and before the first spin you see a second price tag. It is usually placed near the spin button and labelled something like a feature buy or bonus buy. The name in front of you might be a diamond bonus buy, but the mechanism underneath is the same across modern slots: you are being offered a way to skip the base game and start the bonus round immediately, for a fixed multiple of your current stake.
The word diamond is part of one game's presentation, not a separate category of slot. Some titles name their feature after a gem, a vault, or a character. What matters is the structure of the offer, because that is what determines whether the price you pay can ever come back to you.
What a bonus buy purchases
A slot resolves every spin through a random number generator. The RNG produces a number, the game maps that number to reel positions, and the positions are compared against the paytable. A bonus round is simply one of the outcomes the RNG can land on. In the base game, that outcome arrives only when the required scatter symbols or trigger combination appears.
A bonus buy changes the entry condition, not the round itself. You pay a stated amount and the game forces the trigger on the next spin. From that point, the free spins or feature plays under the same rules, the same reel mapping, and the same programmed return as a naturally triggered round. The purchase is a fast-forward, not a better version of the game.
Where the cost is printed
The buy button always states its price as a multiple of your current total stake. If the button reads 50x and your stake is 2 units, the buy costs 100 units. The multiple is fixed by the game's configuration, but the cash amount moves with your stake, which is why the button updates when you change your bet.
Before paying, open the game's information panel. The relevant entries are usually labelled feature buy, bonus buy, or buy pass. Read three things there:
- The exact multiple charged for the feature.
- Whether the bought round uses your current stake or a different one.
- Whether the game's published return figure applies to the base game, the bought feature, or both.
Some games publish one return figure for normal play and a different one for the bought feature. The difference exists because the buy removes all the base-game outcomes that would have occurred before a natural trigger, and those outcomes carry their own return contribution.
What the paytable tells you about the round you are buying
The paytable is the only document in the game that states what a symbol pays, what the scatters do, and how the feature behaves. Read it before you buy, not after. The information panel usually sits behind an "i" or menu icon; the paytable is a separate set of pages inside it.
Look for these four entries:
| Paytable entry | What it tells you |
|---|---|
| Feature trigger | How many scatters or symbols start the round naturally, and what the buy replaces |
| Free spins count | How many spins the bought round grants, and whether retriggers are possible |
| Multiplier rules | Whether wins inside the feature are multiplied, and whether the multiplier grows or resets |
| Special symbols | Which symbols appear only inside the feature, and what they do to the reel layout |
A bought feature does not change these rules. It only changes how you arrived at the feature. If the round grants ten free spins with a rising multiplier, you get the same ten spins and the same multiplier whether the trigger came naturally or through a buy.
Volatility moves, the return does not
Volatility describes how payouts are distributed over time. A high-volatility slot pays rarely but can pay large amounts when it does. A low-volatility slot pays often but in smaller amounts. The bonus buy concentrates your session into the highest-volatility part of the game, because you have removed the base-game spins that normally sit between features.
That does not change the game's programmed return. Volatility and RTP are separate properties. A game can be high volatility with a given return, or low volatility with the same return. Buying the feature changes the shape of your session, not the long-run rate at which the game returns money to players.
As an example, suppose a game returns 96 units for every 100 wagered over a very large number of spins. If the bought feature carries the same return, then buying it does not make the game return more than 96. What changes is that you reach the feature on every buy, so your results cluster around the feature's own payout distribution instead of being spread across base-game and feature outcomes.
Fixed and progressive jackpots inside bought features
Some slots attach a jackpot to the bonus round. A fixed jackpot pays a set amount. A progressive jackpot grows from a share of qualifying wagers and resets after it is won. The paytable states which type applies and whether the jackpot can be won from a bought feature at all.
Read that line carefully. Some progressives require a maximum-stake bet to qualify, and a bonus buy at a lower stake may not meet that condition. Other games exclude bought features from jackpot eligibility entirely. The information panel is where that restriction is printed, and it is the only place in the game where you can verify it.
How the buy interacts with a bonus balance
If you are playing with bonus funds rather than a cash balance, the buy may behave differently. Some games do not allow a feature buy from bonus funds at all. Others allow it but count the buy amount differently toward any wagering requirement attached to the bonus.
A wagering requirement is a multiplier stating how much must be wagered before bonus-related funds can be withdrawn. If a 30x requirement applies to a 50-unit bonus, then 1,500 units must be wagered. The question for a bonus buy is whether the buy amount counts as a wager, and at what weighting. The operator's bonus terms state this, not the game itself. Check those terms before using a buy to work through a requirement, because some operators exclude feature-buy amounts from playthrough or weight them at zero.
What the buy cannot do
No play pattern changes the built-in edge of a negative-expectation game. Buying the feature does not make the round more likely to pay, does not improve the symbols that land, and does not recover money already lost in the base game. The RNG does not know whether the trigger was bought or natural. It produces the same distribution of outcomes either way.
What the buy does change is pace. You reach the highest-variance part of the game immediately, and you pay a fixed price for that access. If the feature pays less than the buy price, the session result reflects that. If it pays more, the session result reflects that too. Neither outcome tells you anything about the next buy.
Reading the offer before you accept it
When a slot shows you a diamond bonus buy or any other named feature buy, treat it as a second wager with its own terms. The button shows the price multiple. The paytable shows what the round contains. The information panel shows whether the return figure differs for the bought round. The operator's bonus terms show how the buy interacts with any promotional balance you are using.
If any of those four sources is unclear, the buy is not worth taking. A feature you cannot read is a feature you cannot price, and the only person the ambiguity helps is the operator.
FAQ
Does buying a bonus change the slot's RTP?
It can, but only if the game publishes a separate return figure for the bought feature. The buy itself does not alter the RNG or the reel mapping. Check the information panel for a feature-buy return figure and compare it with the base-game figure before deciding.
Can a bonus buy qualify me for a progressive jackpot?
Only if the paytable says so. Some progressives require a maximum-stake bet, and a buy at a lower stake may not meet that condition. Others exclude bought features from jackpot eligibility. The restriction is printed in the game's own rules.
Why does the buy price change when I change my stake?
Because the buy is priced as a fixed multiple of your total stake. The multiple stays the same, but the cash amount moves with your bet. The button recalculates the price whenever you adjust the stake, which is why the figure updates before you confirm.
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This article is general information about how these mechanics work. It is not legal advice and not a recommendation to gamble or to use any particular operator. Availability and legality differ by jurisdiction — check the rules that apply where you are.