Luigi’s Mansion: Dark Moon – Treacherous Mansion Gem Checklist

How to find the Round Diamond, Trillion Diamond, Baguette Diamond, Football Diamond, Drop Diamond, Pebble Diamond, Rhombus Diamond, Star Diamond, Octagon Diamond, Oval Diamond, Spindle Diamond, Coffin Diamond and Mushroom Diamond

If you’ve just begun to navigate the Treacherous Mansion’s expansive E-tunnels you’re probably wondering where those precious Gems are hidden. Fear not (well, fear a bit, there be ghouls aplenty) as we’ve got you covered once more with another extract from our official eGuide.

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

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