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507 Bathroom is a location in Luigi's Mansion 3. It is found in the RIP Suites on the fifth floor of The Last Resort. It is a bathroom adjacent to Room 507 and Room 508, Professor E. Gadd's hotel room. The purple Gem can be found here.
Unlike the other bathrooms, this one appears rather run-down. The floor tiles are coming off, the toilet is flipped over, and there is a cracked mirror in the southeast corner. Luigi can suck up the floor tiles to reveal coins.
There is a drape in the northwest corner Luigi can suck up to reveal a hidden area with the purple gem. He can also pull off the cover on the north wall to reveal a green light, then flash it with the Strobulb for Bills to come out of the vent in the bathroom.