Gem

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Gemstones are objects found in Luigi's Mansion: Dark Moon. There are a total of thirteen gemstones hidden in each mansion, adding to a total of sixty-five gemstones in the entire game. Unlike the diamonds in the original game, gemstones do not function as a form of currency, but rather as a collectible. Once a player has collected all thirteen gemstones inside a specific mansion, they will be rewarded with a statue of Luigi with the gemstones encrusted in the stand. The player can view which gemstones they have collected and the statues inside the Vault or by accessing the information via the mansion select screen.

Some gemstones can be obtained on any mission, while some can only be obtained on a specific mission or when certain conditions have been met.

Amethysts

Image	Gem	Available Missions	Location
	Round Amethyst	A-1, A-2, A-3, A-4, A-5, A-Bonus	Mudroom Exterior - In the Mudroom, the player should use their Strobe Light on the right door to open it. When they are outside they'll need to vacuum this gem down from the trees at the end of the path.
	Trillion Amethyst	A-1, A-2, A-3, A-4, A-5, A-Bonus	Front Yard - Use your Strobe Light on the flowers.
	Baguette Amethyst	A-2, A-3, A-4, A-5, A-Bonus	Parlor - Use your Strobe Light on the clock.
	Football Amethyst	A-2, A-3, A-4, A-5, A-Bonus	Studio - The player should look into the camera to notice the gem hidden behind the left-most curtains.
	Drop Amethyst	A-3, A-Bonus	Entrance - The player should press X near the right suit of armor to knock down its helmet. The player can then use the helmet to hit a painting on the left wall.
	Pebble Amethyst	A-3, A-4, A-5, A-Bonus	Dining Room - The player needs to use the Strobe Light on a safe in the ceiling.
	Rhombus Amethyst	A-3, A-4, A-5, A-Bonus	Kitchen - The player should interact with the stove (walk up to it and press X) in order to start up a fire. Then, the player should open the fridge to reveal this gem frozen in ice. The player can melt the ice using the stove's open flames.
	Star Amethyst	A-3, A-4, A-5, A-Bonus	Foyer - In the Common Hall, the player should go to the end of the hall and use the Dark Light to reveal a hidden door. The door will lead to the Patio. In the Patio, the player can reveal another door along the left wall using the Dark Light. The player should enter the door to be in a new area (Under the Stairs). The player should then take the door on the left to be taken to the Foyer (behind the fish tank), where the Amethyst can be found.
	Octagon Amethyst	A-3, A-4, A-5, A-Bonus	Patio - The player should use the Dark Light to reveal a hidden fountain next to the other two in the water.
	Oval Amethyst	A-3, A-4, A-5, A-Bonus	Library - The player should use the Dark Light to reveal a hidden ball along the left wall. The player can then take the ball to the fireplace to reveal the gem.
	Spindle Amethyst	A-2, A-3, A-4, A-5, A-Bonus	Study - The player needs to pull down the left-most curtains on the back wall. Then the player will need to shine the Dark Light on the painting to reveal the gem.
	Coffin Amethyst	A-5, A-Bonus	Rafters - This gem is on top of a dresser on the far-right side of the area. The player can vacuum it down easily.
	Mushroom Amethyst	A-5, A-Bonus	Bedroom - Burn the giant web, then run behind it to find this Amethyst.

Emeralds

Image	Gem	Avaliable Missions	Location
	Round Emerald	B-1, B-2, B-3, B-4, B-5, B-Bonus	Tower Lobby - On the left side of the area, the player can walk behind the stairs to find the Emerald.
	Trillion Emerald	B-1, B-Bonus	Laboratories - Use a Balloon Berry to float into the test tubes on the left, then vacuum the cobwebs holding the Emerald.
	Baguette Emerald	B-2, B-3, B-4, B-5, B-Bonus	Garden - The player should fill up a bucket with water, then use it to water the flower on the right wall. After the flower grows, the player should use their Strobe Light on it to reveal this Emerald.
	Football Emerald	B-2, B-3, B-4, B-5, B-Bonus	Botany Lab - The player should fill up the bucket (in this room) with water, then use it to water the flower on the back wall. After the flower grows, the player should use their Strobe Light on it to reveal this Emerald.
	Drop Emerald	B-2, B-3, B-4, B-5, B-Bonus	Seedling Laboratory - After defeating all the ghosts in this room, use the Potato Shooter to shoot the mouse carrying this Emerald.
	Pebble Emerald	B-3, B-4, B-5, B-Bonus	Tower Lobby/Maintenance/West Garden - In the Tower Lobby, the player needs to reveal some invisible pipes on the left wall using the Dark Light. After that, the player needs to reveal a hidden door (using the Dark Light) next to the left one on the bottom floor. Inside, use the Thorn Plant to defeat the Venus Trap and access the Emerald.
	Rhombus Emerald	B-3, B-Bonus	Hollow Tree - After climbing to the top and falling back down, the player needs to light up a ball of silk and use it to burn the cobwebs on the left side. Behind the web is a bucket, which the player can fill using the water in the middle of the room. The player needs to take the filled bucket to the right side and water a flower. After it has grown, the player needs to use the Strobe Light on it to reveal the Emerald.
	Star Emerald	B-3, B-4, B-5, B-Bonus	Old Cemetery - The Emerald is sitting on a tree branch on the left side of the area. Use the vacuum to grab it.
	Octagon Emerald	B-4, B-Bonus	Skybridge - The player needs to vacuum the third plant hanging in order to get this Emerald.
	Oval Emerald	B-4, B-5, B-Bonus	Rumpus Room - The player needs to walk around the doll counter-clockwise in order to reveal the Emerald.
	Spindle Emerald	B-4, B-5, B-Bonus	Solarium - The player needs to use the Dark Light to reveal a chest hidden on the table.
	Coffin Emerald	B-4	Conservatory - Use a Balloon Berry to float to a balcony to the right, then the player needs to use the Dark Light to reveal a hidden door. When the player enters, they'll be in a bonus area, and the goal is to collect all 8 red coins within 15 seconds. Upon doing so, a chest containing the Emerald will appear.
	Mushroom Emerald	B-4, B-5, B-Bonus	West Bathroom - After defeating all the ghosts in this room, pull on the toilet paper roll on the left wall to reveal this Emerald.

Rubies

Image	Gem	Mission	Location
	Round Ruby	C-1 A Timely Entrance	Clockwork Court - Uncover a hidden toolbox with the Dark-Light and open it.
	Trillion Ruby	C-1 A Timely Entrance	Warehouse - Uncover a hidden green spool with the Dark-Light and unwrap with the machine.
	Baguette Ruby	C-1 A Timely Entrance	Clock Tower Gate - Uncover the hidden toolbox on the top left corner with Dark-Light and open it.
	Football Ruby	C-2 Underground Expedition	Storm Cellar - Suck up a sheet to reveal a painting and use to Dark-Light to get the gem out.
	Drop Ruby	C-2 Underground Expedition	Canyon Stairs - Suck the gem on the cobweb on the right wall.
	Pebble Ruby	C-2 Underground Expedition	Quarry - Pull cord from the mine cart to move it out of the way, go in the tunnel to find the gem on the web.
	Rhombus Ruby	C-3 Roundhouse Brawl	Clockmaker's Chambers - Suck the rug to reveal a fan, suck the fan to adjust the digital clock to 9.00 to wake the Greenie holding the gem.
	Star Ruby	C-3 Roundhouse Brawl	Roundhouse - Cross the beam to the right, then walk down to a toolbox with the gem.
	Octagon Ruby	C-3 Roundhouse Brawl	Roundhouse - Climb the stairs from the Transition Hall to the end to find the gem.
	Oval Ruby	C-5 Piece at Last	Gear Chamber - Uncover a plank of wood with the Dark-Light between the crates and walk to a secret passage to find a door that leads to a red coin challenge.
	Spindle Ruby	C-5 Piece at Last	Maintenance Hub - Use the Dark-Light to reveal a toolbox with the gem.
	Coffin Ruby	C-5 Piece at Last	Service Elevator - Pick up the Yellow Toad and launch him to the other side, make him walk to the end and he'll give the gem.
	Mushroom Ruby	Showtime	Movements - Walk left to the window to suck the last gem.

Sapphires

Image	Gem	Mission	Location
	Round Sapphire	D-1 Cold Case	Smokehouse - Use the Dark-Light Device to reveal the missing scarf, then pull both scarves.
	Trillion Sapphire	D-1 Cold Case	Fishing Hut - Vacuum the Gem under the floorboards.
	Baguette Sapphire	D-1 Cold Case	Under the Ice - Launch Blue Toad into the top of the shaft.
	Football Sapphire	D-1 Cold Case	High Wires - Ride the first cable and vacuum the Gem down from the nest.
	Drop Sapphire	D-1 Cold Case	Airway - Use the binoculars to locate the Gem; collect it after it moves to the barrel.
	Pebble Sapphire	D-2 Hit Rock Bottom	Chalet Approach - Use a flaming turkey to melt the ice, then shine the Dark-Light Device at the framed sketch.
	Rhombus Sapphire	D-2 Hit Rock Bottom	Prospector's Crossing - Reveal the missing pickaxe and spin it. Carry both logs onto the ice.
	Star Sapphire	D-2 Hit Rock Bottom	Skip Slope - Slide through the spinning wheel near the west wall.
	Octagon Sapphire	D-2 Hit Rock Bottom	Shaft - Pull the chain at the base of the Shaft, then ride back up to find the Gem.
	Oval Sapphire	D-2 Hit Rock Bottom	Deep Hall - Ignite a piece of coal, then launch it at the Gem in the ceiling.
	Spindle Sapphire	D-3 Across the Chasm	Crossroads - Reveal the cart on the west ledge and vacuum the snow mound inside it.
	Coffin Sapphire	D-3 Across the Chasm	Chalet - Use the Crystal Quarry E-Gate to drop onto the Chalet couch.
	Mushroom Sapphire	D-3 Across the Chasm	High Wires - Reach the outhouse and complete the bonus challenge within it.