Red Diamond

Red Diamonds are surprisingly cheap and obscure treasures in Luigi's Mansion. Unlike the Blue and Gold Diamonds, each Red Diamond is only worth 5,000G, the same amount as a Gold Coin. There are only two, and one of them is King Boo's crown, automatically given to Luigi when he sucks King Boo after his epic battle on the roof. The other is found by watering a plant on the Balcony.