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.
Amethysts
| Gem | Mission | Location |
|---|---|---|
| Round Amethyst | A-1 Poltergust 5000 | Mudroom Exterior - Vacuum the Gem from the tree. |
| Trillion Amethyst | A-1 Poltergust 5000 | Front Yard - Flash the purple flowers. |
| Baguette Amethyst | A-2 Gear Up | Parlor - Flash the clock. |
| Football Amethyst | A-2 Gear Up | Studio - Look through the camera to locate the Gem near the window. |
| Drop Amethyst | A-3 Quiet Please! | Entrance - Search the armor, then launch the helmet into the painting. |
| Pebble Amethyst | A-3 Quiet Please! | Dining Room - Flash the safe in the ceiling. |
| Rhombus Amethyst | A-3 Quiet Please! | Kitchen - Grab the ice in the refrigerator and melt it on the stove. |
| Star Amethyst | A-4 Visual Tricks | Foyer - Reveal the missing door in the Patio, then head in and search behind the aquarium. |
| Octagon Amethyst | A-4 Visual Tricks | Patio - Use the Dark-Light Device to reveal the missing fountain. |
| Oval Amethyst | A-4 Visual Tricks | Library - Use the Dark-Light Device to reveal the missing globe. Launch the globe to break it open. |
| Spindle Amethyst | A-4 Visual Tricks | Study - Pull the curtains, then use the Dark-Light Device on the framed sketch. |
| Coffin Amethyst | A-5 Sticky Situation | Rafters - Collect the Gem from the top of the mirror. |
| Mushroom Amethyst | A-5 Sticky Situation | Bedroom - Clear the webs, then move behind the dressing screen. |
Emeralds
| Gem | Mission | Location |
|---|---|---|
| Round Emerald | B-1 A Job for a Plumber | Tower Lobby - Under the stairs, go through the passage way behind them. |
| Trillion Emerald | B-1 A Job for a Plumber | Laboratories - Float up and then back into the tube, vacuum the cobwebs. |
| Baguette Emerald | B-2 The Pinwheel Gate | Garden - Fill the bucket with water, water all plants, flash the plant near the bottom. |
| Football Emerald | B-2 The Pinwheel Gate | Botany Lab - Activate the machine, fill the bucket with water, water the plant and flash it. |
| Drop Emerald | B-2 The Pinwheel Gate | Seedling Laboratory - Use the potato shooter to shoot the mouse. |
| Pebble Emerald | B-3 Graveyard Shift | Tower Lobby - Reveal invisible pipes on the left, activate pump, reveal invisible door at the base of the stairs, shoot a spiked ball at the Piranha Plant. |
| Rhombus Emerald | B-3 Graveyard Shift | Hollow Tree - Light a ball of web, go through the left alcove, grab the bucket, fill it, and water the flower in the right alcove. |
| Star Emerald | B-3 Graveyard Shift | Old Cemetery - Hanging in a vine near the entrance, look up. |
| Octagon Emerald | B-4 Pool Party | Skybridge - Suck up all hanging flowers, last one has the emerald. |
| Oval Emerald | B-4 Pool Party | Rumpus Room - Walk slowly around the doll counter-clockwise until its head pops off. |
| Spindle Emerald | B-4 Pool Party | Solarium - Reveal a chest on the empty table when you walk in. |
| Coffin Emerald | B-4 Pool Party | Conservatory - Float to the right side, reveal a door to a pocket dimension game, the prize is the gem. |
| Mushroom Emerald | B-4 Pool Party | West Bathroom - Pull on the toilet paper roll. |
