Gem

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 condition or when certain conditions have been met.