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Reel Gems slot from Microgaming

Reel Gems slot from Microgaming
The same year that Microgaming released the epic 243 win ways Thunderstruck II slot, the developer also published this uncomplicated game, entirely focused on 5 precious stones. Reel Gems slot machine (as the name suggests) depicts yellow citrines, blue sapphires, green emeralds, red rubies and the ever so shiny diamonds. As usual, they are the players’ best friends. We advise you to try the Thunderstruck Wild Lightning slot by Microgaming for free.

Six card suits fill up the lower part of the paytable. Nothing new here, but what set this slot apart back then was the innovative for that time Re-spin function. A true novelty in 2010. It allows the player to spin reels separately, getting a second chance to land a win still. In fact, you can spin the same reel or any other reel as often as you wish, but for it all, you will be extra charged, of course. The toll for the Re-spin is clearly pointed out, so it’s up to the player to decide what’s wise and what’s reckless. The slow jazzy “elevator music” is in stark contrast with the excitement of the Re-spin feature, but it’s helpful in the sense that it keeps your emotions in control. When you know there are a 120 000 coins grand prize just around the corner; this is no easy feat. With a Medium Volatility and plenty of RTP - 96.52%, this machine might just become one of the few in your "precious" slots collection.

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Personal testers’ opinion

  • Simple or not, the Re-spin feature makes every spin exciting. Do it! Or don’t do it? Which reel? More than once? Another reel, maybe? So many opportunities and probabilities. It’s not for indecisive people, that’s for sure. It could take them up to 10 minutes before they finally muster up the courage to activate the spin button, close their eyes and slowly open them to see the result.
    (If they only knew how the RNG - Random Number Generator is working even behind the scene, even when you delay to push with a single second…)
  • Anyway, we had a blast with this function, even though we soon realized: it rarely seems to work in the players’ favour. The slot hit probability is statistically around 40% (near 4 out of 10 spins results in some kind of win), which is above average. But then again, that doesn’t mean anything when the wins are smaller than the bet. However, 5OAK of the cheap symbols are coming easy here, and our testers did score a max win of 119x the total bet in the base game. The problem is the Free Spins. Despite the multiplier x3 on each spin, the average figure of the test bonus spins didn’t come above 26x the total bet. So, don’t hold your hopes high for the bonus payouts. Only 1 of the 15 spins carries a large payout in this mode, resulting in an unsatisfactory total outcome of the bonus. Plus, the Free Spins are also not triggered too often - every 197th spin, statistically.
  • Downright spelled: the slot is old-fashioned but still popular, with a high RTP but not always lavish in payouts. Unfortunately, the gems are also not markedly good at maintaining the balance levelled for extended sessions. So, we can only allot neutral directions to the players willing to exploit this slot for bonus money wagering - 5.1 index points (out of 10).

The hidden parameters of the Reel Gems slot (data from the testing team)

  • The frequency of triggering the bonus is statistically, every 197th spin (0,51%).
  • The probability of a hit (any winning) is 40,20%.
  • The distribution of the winnings is 73% in the main game and 27% in the bonus feature.
  • The maximum payout during the tests was 119x.
  • The average winning from the bonus was 26x.
  • Volatility is 6,26 out of 20 (average).
  • Cycle length is average.
  • The rating of the slot machine for the wagering is 5.1 out of 10.
  • RTP of 96.52% allows getting a positive mathematical expectation at the casino.


  • Reel Gems Wild Logo - Only lands on reels 1 and 4 and are not precious at all (not paid). They do substitute for all other symbols, except for Diamond Ring Scatters.
  • Re-spin feature - After each losing spin, you can decide to spin any reel again (one at a time only) as many times as you like to complete a win. The win probability determines the price of the Re-spin.
  • Free Spins - Landing 3, 4 or 5 Diamond Ring Scatters (paid well: 100x the bet for 5OAK) anywhere on the reels will trigger 15 Free Spins (which can be re-triggered) where all wins are tripled.


  • Provider - Microgaming
  • The number of the reel is 5
  • The number of payouts is 243
  • The cost of one coin is from 0.01 to 0.50
  • The number of coins per line is from 1 to 10
  • The range of coin sizes is from 0.25 to 125
  • Maximum winning for the spin is x4000 (five Diamonds)
  • Maximum winning in the bonus feature is 120 000 coins (in Free spins mode)
  • Wild symbol - yes (game logo)
  • Scatters - yes (Ring with the inscription Free spins)
  • Bonus rotations - yes (15 free spins with multiplier x3 from scatters symbols)
  • The expected percentage of payments in the slot is 96.52%, allowing you to increase your welfare and win a lot of money.

Where to play?

  • Play over 5300 games, including Reel Gems slot at Fastpay Casino, the best gambling place in Canada. You will be pleased with the excellent customer care, VIP bonus program for loyal players and super-fast withdrawals (1-5 minutes.)

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Written by Kamen Valev
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