Emerald (Resident Evil 4 Remake - Separate Ways)

Available to trade from the Merchant from Chapter 2.

Inside the lantern hanging from the wooden structure at the far end of the south eastern path.

Dropped by the Chainsaw Villager when he is defeated.

Inside the lantern hanging from the ceiling between the two sets of crushing rocks in the southern passageway. This area becomes accessible once you have pulled the switch in the Switch Cavern to activate the crushing rocks.

On the Brute that appears here after acquiring the Rocket Launcher (Special). He will drop this when defeated.