Emerald is a two-entrance station situated on both sides of Emerald Street between Luddite Row and Albany Avenue, at the border between Lower Easton and Chinatown in Algonquin, Liberty City. The station is particularly close to Algonquin's hidden arms dealer just southwest of the station.
The station has also been featured extensively during "Three Leaf Clover", when the player's team is forced to escape into the station from the police following a bank heist. The mission also reveals the station featuring a service exit to Easton located further north from Emerald station, before Easton station.
Signs depicting the A/8 train platform in the station show the wrong information. Instead of showing "Next stop: Castle Gardens", the sign shows "Next stop: Emerald", which is the current station.