Gem

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Luigi collecting an amethyst in the Parlor in Gloomy Manor.

Gemstones are valuable objects found in Luigi's Mansion: Dark Moon. There are thirteen Gemstones hidden in each of the five mansions in the game, making a grand total of sixty five Gemstones in the entire game. Amethysts are found in Gloomy Manor, emeralds are found in Haunted Towers, rubies are found in Old Clockworks, sapphires are found in Secret Mine, and diamonds are found in Treacherous Mansion. The coloration of the five sets of thirteen Gemstones corresponds to the theme of the five mansions. Unlike the Red, Silver, and Gold Diamonds found in the original game, Gemstones do not function as a form of currency, but rather as a collectible. Once the player has collected all thirteen Gemstones in a mansion, they will be rewarded with one of five different statues of Luigi with the Gemstones encrusted in the stand. The player can see the Gemstones they've collected inside the Vault, on the mansion select screen, when one is collected in a mansion, and when the totals and records are displayed at the end of a mission. Any statues that have been unlocked can only be viewed inside the Vault.

Some Gemstones can be obtained in any mission, while some can only be obtained in a specific mission or once 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 Strobulb 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.
	Triangle Amethyst	A-1, A-2, A-3, A-4, A-5, A-Bonus	Front Yard - Use the Strobulb on the flowers.
	Baguette Amethyst	A-2, A-3, A-4, A-5, A-Bonus	Parlor - Use the Strobulb 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 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 Strobulb 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 globe along the left wall. The player can then shoot the globe out of the Poltergust 5000 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.
	Triangle 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 Strobulb 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 Strobulb 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 seed shooter to shoot the mouse carrying this Emerald.
	Pebble Emerald	B-2, 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 Strobulb 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-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

This section is about the Gemstone from Luigi's Mansion: Dark Moon. For information about the treasure in Wario World, see here. For the character in Super Paper Mario, see here.

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.
	Triangle 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. (Luigi 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 Strobulb on the mechanism along the wall. This will cause a rope to appear. 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.
	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.
	Triangle Sapphire	D-1, D-2, D-3, D-Bonus	Fishing Hut - The gem is hidden 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.
	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 needs to 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 - The player needs to use the Dark Light to reveal an axe in the bottom-right corner of the room. After exposing it, the player needs to use their vacuum on it to reveal two logs. The player must place the two logs and Luigi on the ice to get the Sapphire.
	Star Sapphire	D-2, D-3, D-Bonus	Skip Slope - While sliding down the slope, the player may notice a big spinning wheel to the left. The player needs to slide behind the wheel to get this Sapphire.
	Octagon Sapphire	D-2, D-3, D-Bonus	Shaft - At the bottom of the Shaft, the player may notice a chain hanging on the wall. The player needs to pull the chain, which will open a hatch further up the Shaft. The player must then climb back up the Shaft to get this Sapphire.
	Oval Sapphire	D-2, D-3, D-Bonus	Deep Hall - The player must light a piece of coal and shoot it at the Sapphire located above the door leading to the Crystal Quarry.
	Spindle Sapphire	D-3, D-Bonus	Crossroads - The player must use the Dark Light to reveal a hidden mine cart on the left wall. After exposing it, the player must vacuum the snow in order to get this Sapphire.
	Coffin Sapphire	D-3, D-Bonus	Crystal Quarry/Chalet - The player needs to use the portal located in the Crystal Quarry, which will take them to the Chalet, and the Sapphire will be exposed.
	Mushroom Sapphire	D-3	High Wires - The player needs to use the Coal Shooter in the Gondola to melt the ice supporting a tree on the left. After the tree falls, the player can cross it to find an outhouse, which contains a bonus room. The goal is to shoot a snowball at each of the 3 Hiders in under 60 seconds. Upon doing so, the Sapphire will be revealed.

Diamonds

Image	Gem	Available Missions	Location
	Round Diamond	E-1, E-Bonus	Underground Lab - Spin the wheel to zap the armor, then launch the helmet at the glass jar on the wall.
	Triangle Diamond	E-1, E-Bonus	Haunted Catacombs - Burn the webs in the second half of the Haunted Catacombs.
	Baguette Diamond	E-1, E-Bonus	Haunted Catacombs/Cliffside - Reach the Cliffside's B2 level and vacuum the Gem down from the vine.
	Football Diamond	E-2, E-3, E-5, E-Bonus	Front Entrance - Reveal and pull the missing chain attached to the gargoyle, then open the safe under the stairs.
	Drop Diamond	E-2, E-3, E-5, Bonus	Restrooms - Pull the chain in the west half of the Restrooms.
	Pebble Diamond	E-2, E-Bonus	Ice Age Exhibit/Gargoyle Roof - Launch the stars into the constellation's empty slots.
	Rhombus Diamond	E-2, E-3, E-5, E-Bonus	Ancient Exhibit - Water the sprout near the door, then flash the purple flower.
	Star Diamond	E-3, E-5, E-Bonus	Aviation Exhibit - Pull each of the hot air balloon's sandbags.
	Octagon Diamond	E-3, E-5, E-Bonus	Nautical Exhibit - Open the chest at the end of the pirate ship.
	Oval Diamond	E-3, E-5, E-Bonus	Front Entrance/Dark Age Exhibit - Place the blue book from the Front Entrance into the slot on the bookcase.
	Spindle Diamond	E-3	Jungle Exhibit - Use the gold bulb to collect the coins that appear, then open the revealed chest.
	Coffin Diamond	E-3	Ice Age Exhibit - Use the gold bulb to collect the coins that appear, then open the revealed chest.
	Mushroom Diamond	E-3, E-5, E-Bonus	Train Exhibit - Reveal the missing piece of the track, then ride the train around the room.

Trivia

• Apart from the Amethyst, all of the Gemstones are named after Pokémon games.