There are six collectible gems on each floor in Luigi’s Mansion 3. In this guide, I’ll show you where to find all six gems on the 10F floor and tell you how to get your hands on them. You’ll need to unlock certain abilities before you’ll be able to collect some of these gems, so you may have to come back later on in the game.
Please note that some of the gems will appear clear rather than coloured in the screenshots seen below, this is because I had already collected them during my playthrough before creating this guide.
Gem #1 – Elevator Hall
When you come out of the elevator, follow the corridor to the right all the way to the end. When you reach the end you’ll see a snake statue on the wall with a ball-chain next to it. Use your vacuum to pull the ball-chain all the way back and a bunch of bats will fly out of the snakes mouth. Defeat these bats then pull the ball-chain again and the snakes mouth will open again, revealing the Red Gem. Keep hold of the ball-chain and summon Gooigi, then use his vacuum on the gem to get hold of it.
Gem #2 – Sandy Grand Hall
Head through the door and into the Sandy Grand Hall. Once inside, go over to the right hand side of the room and you’ll see both the head and tail of a huge snake, with the rest of its body buried under sand. Use your vacuum to clear all of the sand and you’ll see that two sections of the snakes body are missing. Use your Dark Light on both sections to complete the snake and its mouth will open and spit out the Yellow Gem.
Gem #3 – Sandy Grand Hall
Now head on over to the left hand side of the room and you’ll find a big pile of sand just to the left of the pyramid. Use your vacuum to suck up this sand and you’ll nab yourself the Purple Gem.
Gem #4 – Central Chamber
Go inside the pyramid and drop through the hole in the floor to get into the Central Chamber. Then, go over to the right hand side of the room to find a sarcophagus facing the camera. Perform a Suction Shot on the centre of its chest to reveal another one inside it, then perform a Suction Shot on that one too. That should reveal a ghost, which can be defeated to earn yourself the Clear Gem.
Gem #5 – Scale Chamber
Once you’ve solved the puzzle in the Scale Chamber, a small grate will appear in the floor. Summon Gooigi and slip through the grate and you’ll find a chest which contains the Green Gem.
Gem #6 – Jewel Chamber
Enter the Jewel Chamber and perform a Suction Shot on the pot to the left of the statue which sits at the far end of the room. Breaking the pot will reveal an X-shaped puzzle piece which you can suck up with your vacuum. Do so and walk back towards the entrance to the room, then look at the wall on the left near the entrance. You’ll spot an X-shaped hole in the wall which you can fire the puzzle piece into, which will raise the wall to reveal the Blue Gem sitting behind.
And that’s it! Congratulations, you collected all six gems.