Yellow Diamond (Resident Evil 4 Remake)

Available to trade from the Merchant from the start of the game.

Inside the locked chest of draws in the south corner of the room. You need to use a Small Key to open it.

Dropped by El Gigante after his defeat.

Inside the lantern hanging from the ceiling in the middle of the room.

Inside the large treasure chest in the south end of the accessible wooden walkway on the west side of the area.

Inside the large treasure chest underneath the walkway bridge. You need to use the lever in the south east corner of the Gallery Balcony to raise the bridge in order to reveal the chest.

Inside the lantern hanging from the ceiling on the south section of the corridor.

Inside the large treasure chest at the end of the east section of the room. This section becomes available once you have restored power to the elevator in the power room.

Dropped by the non-armored El Gigante when defeated.

Inside the lantern hanging from the scaffold.

Inside the lantern hanging from the ceiling in the passageway leading to the main room.

Dropped by the Armadura (Strong Threat) when it is defeated in Chapter 10.

Dropped by the Iron Maiden that emerges from the body bag in the middle of the south east caged area of the room when it is defeated.