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The Diamond is worth 2,000 BP. It is the most valuable treasure item in the game.
Location[]
In Claire's Episode 4: Metamorphosis, at the outside part of the Tower when the 6:40 countdown starts, there is one Military Box. Inside it is the Diamond.
In Barry's Episode 4, on the way to activate the ventilation system, a Diamond can be found embedded in the wall at the dead end of a passage filled with poisonous gas.