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	Available 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	Available Missions	Location
	Round Ruby	C-1, C-2, C-3, C-4, C-5, C-Bonus	Clockworks Court - The player needs to go all the way to the right side of the area, then they'll need to use the Dark Light to reveal a tool box containing this Ruby.
	Trillion Ruby	C-1, C-2, C-3, C-4, C-5, C-Bonus	Warehouse - The player needs to use the Dark Light to reveal a hidden green spool on top of the boxes, then they'll need to unravel it using the machine in this room.
	Baguette Ruby	C-1, C-2, C-3, C-4, C-5, C-Boss, C-Bonus	Clock Tower Gate - The player needs to use the Dark Light to reveal a hidden tool box in the top-left corner of the room.
	Football Ruby	C-2, C-3, C-4, C-5, C-Bonus	Storm Cellar - The player needs to vacuum a sheet in the bottom-left corner to reveal a painting. Use the Dark Light on it to reveal the Ruby.
	Drop Ruby	C-2, C-3, C-4, C-5, C-Bonus	Canyon Hall/Canyon Stairs - In the Canyon Hall, the player should take a detour down a secret passageway on the right. Their will be a door that leads to the Canyon Stairs. The player should notice the gem stuck on a cobweb along the right wall. Use the vacuum to get the Ruby.
	Pebble Ruby	C-2, C-3, C-4, C-5, C-Bonus	Quarry - The player needs to pull on the mine cart TWICE to reveal a hole behind it. The player should go into this hole to find the Ruby.
	Rhombus Ruby	C-3, C-4, C-5, C-Bonus	Clockmaker's Chambers - The player will need to vacuum the rug to reveal a gear. The player needs to vacuum up/blow on the gear and make the alarm clock set to 9:00. Upon doing so, a ghost (holding the Ruby) will wake up. Defeat the ghost to obtain this Ruby.
	Star Ruby	C-3, C-4, C-5, C-Bonus	Roundhouse (Upper) - The player needs to cross the beams located in the middle of the walkway along the back balcony. Follow this walkway to find a tool box containing this Ruby.
	Octagon Ruby	C-3, C-4, C-5, C-Bonus	Roundhouse (Lower) - The player needs to use the door in the Transportation Hall that leads to the Roundhouse. After going down the first set of stairs, the player needs to continue going left into a secret area containing the Ruby.
	Oval Ruby	C-5	Gear Chamber - The player needs to cross the boxes along the right wall. (NOTE: You'll need to reveal some of them using the Dark Light.) This leads to a hidden door containing a bonus room, where the player must collect 8 red coins within 15 seconds. Upon doing so, a chest containing this Ruby will appear.
	Spindle Ruby	C-5, C-Bonus	Maintenance Hub - The player needs to use the Strobe Light on the mechanism along the wall. This will cause a rope to come to you. Grab the robe, and fall into the "pit" below. Use the Dark Light to reveal a chest in the center of the area, which contains this Ruby.
	Coffin Ruby	C-5	Service Elevator - After leading Toad here, pick him up and launch him toward the bottom-right corner of the area. Toad will land on a walkway, where he'll grab the Ruby for you.
	Mushroom Ruby	C-Boss, C-Bonus	Movements - The player needs to walk up to the window on the left, then vacuum the Ruby to acquire it.

Sapphires

Image	Gem	Available Missions	Location
	Round Sapphire	D-1, D-2, D-3, D-Bonus	Smokehouse - The player needs to use the Dark Light to reveal a missing scarf, then the player needs to pull both of the scarves to reveal the Sapphire.
	Trillion Sapphire	D-1, D-2, D-3, D-Bonus	Fishing Hut - The gem is hidden very well in the bottom-left corner of the room. The player needs to use the vacuum to get this Sapphire.
	Baguette Sapphire	D-1	Under the Ice - After falling down here, the player needs to pick up Toad and launch him into the shaft on the upper balcony. Upon doing so, the Sapphire will become yours.
	Football Sapphire	D-1, D-2, D-3, D-Bonus	High Wires - The player needs to use the cables to cross the ravine, then the player needs to vacuum the Sapphire down from the bird's nest.
	Drop Sapphire	D-1, D-2, D-3, D-Bonus	Airway - The player will need to enter the Airway via the Terminal. Then, the player should look into the telescope and spot the Sapphire being taken to a barrel on the lower area. The player needs to get to the barrel and look inside to find the Sapphire.
	Pebble Sapphire	D-2, D-3, D-Bonus	Chalet Approach - The player needs to use a flaming turkey (left of door) to burn the ice surrounding the painting in front of the Snowman. Then, the player needs to use the Dark Light on the paining to reveal the Sapphire.
	Rhombus Sapphire	D-2, D-3, D-Bonus	Prospector's Crossing - ???
	Star Sapphire	D-2, D-3, D-Bonus	Skip Slope - ???
	Octagon Sapphire	D-2, D-3, D-Bonus	Shaft - ???
	Oval Sapphire	D-2, D-3, D-Bonus	Deep Hall - ???
	Spindle Sapphire	D-3, D-Bonus	Crossroads - ???
	Coffin Sapphire	D-3, D-Bonus	Crystal Quarry/Chalet - ???
	Mushroom Sapphire	D-3	High Wires - ???

Diamonds

Image	Gem	Available Missions	Location
	Round Diamond	E-1, E-Bonus	Underground Lab - ???
	Trillion Diamond	E-1, E-Bonus	Haunted Catacombs - ???
	Baguette Diamond	E-1, E-Bonus	Haunted Catacombs/Cliffside - ???
	Football Diamond	E-2, E-3, E-5, E-Bonus	Front Entrance - ???
	Drop Diamond	E-2, E-3, E-5, Bonus	Restrooms - ???
	Pebble Diamond	E-2, E-Bonus	Ice Age Exhibit/Gargoyle Roof - ???
	Rhombus Diamond	E-2, E-3, E-5, E-Bonus	Ancient Exhibit - ???
	Star Diamond	E-3, E-5, E-Bonus	Aviation Exhibit - ???
	Octagon Diamond	E-3, E-5, E-Bonus	Nautical Exhibit - ???
	Oval Diamond	E-3, E-5, E-Bonus	Front Entrance/Dark Age Exhibit - ???
	Spindle Diamond	E-3	Jungle Exhibit - ???
	Coffin Diamond	E-3	Ice Age Exhibit - ???
	Mushroom Diamond	E-3, E-5, E-Bonus	Train Exhibit - ???

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