Rio Gems is a colorful carnival gems-themed Hold & Win slot by 3 Oaks on a 5x3 grid with 25 winlines. The game features Diamond Bonus symbols, Super Diamonds, Mystery symbols, and five jackpot levels including a massive 10,000x Royal Jackpot.
How to Play Rio Gems
The game plays on a standard 5x3 layout with 25 winlines. Wins are paid left to right for 3 or more matching symbols. Wilds substitute for regular symbols and pay up to 12x. Landing 6 or more Diamond symbols triggers the Hold & Win feature, while 3 Scatters activate Free Spins.
Rio Gems Theme & Graphics
The slot mixes vibrant gems with lively carnival motifs, featuring dancers and colorful symbols against a festive backdrop. The graphics are bright and more animated than many 3 Oaks titles, creating a pleasant and energetic atmosphere.
Rio Gems Slot Features
5x3 Grid with 25 Winlines
Wild Symbols (up to 12x)
Diamond Bonus Symbols
Super Diamond Symbols
Mystery Diamond Symbols
Free Spins with No Low Pays
Rio Gems Bonus Features
Hold & Win Feature
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Triggered by 6+ Diamond symbols (starts with 3 respins)
New Diamonds reset respins to 3
Diamonds carry cash values
Mystery Diamonds transform into jackpot or Super Diamond symbols
Super Diamonds (higher values) can appear on reel 5 in base/Free Spins or anywhere in Hold & Win
Mini Jackpot – 20x
Minor Jackpot – 50x
Major Jackpot – 150x
Grand Jackpot – 2,000x
Royal Jackpot – 10,000x (full grid)
Free Spins Feature
Triggered by 3 Scatters (awards 8 Free Spins)
No low-paying symbols during the round
Retriggers with 3 Scatters award +8 extra Free Spins
Rio Gems Buy Options
No information on Bonus Buy feature
Rio Gems Betting, RTP & Max Win
According to Roobet Casino Rio Gems offers the following to players:
Reels & Rows – 5x3
Pay Type – 25 Winlines
Min Bet – £0.25
Max Bet – £25
RTP – 95.69%
Volatility – High
Max Win – 10,000x
Bonus Buy – Not specified
Rio Gems Summary
Rio Gems is a lively and well-executed Hold & Win slot from 3 Oaks with festive visuals, Super Diamonds for bigger values, Mystery symbols, and a strong 10,000x Royal Jackpot. While it follows the studio’s familiar formula, the extra layers in the bonus and cleaner Free Spins make it one of the more entertaining carnival/gem-themed releases in their extensive Hold & Win catalog.
Our Favorite Casino for Rio Gems
If you want the best place to play Rio Gems, Roobet is our top recommendation. With instant signup, fast crypto deposits, and a massive library of 3 Oaks Gaming titles, Roobet delivers one of the smoothest slot experiences online. You’ll also find exclusive promotions, Roobet Rewards, and 24/7 live support making it the ideal home for spinning Rio Gems with confidence and convenience
Slot Tracking Tools for Rio Gems
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