The ruby harvest is a butterfly that players can capture with the Hunter skill at level 15 or above, granting 24 Hunter experience.
Players can find ruby harvests at the Piscatoris Hunter area just south of the Piscatoris Fishing Colony (fairy ring code AKQ). The nearest bank to this location is in Piscatoris Fishing Colony, which may not be entered until the quest Swan Song has been partially completed. Ruby harvests are also found in the Kourend Woodland just North of Reginald, Roy jr., and a duck. This location is quite close to the bank in Land’s End, which has no quest requirements to access.
Players must wield a butterfly net and have at least one butterfly jar in their inventory to catch any butterfly. One jar is needed for each butterfly you wish to keep. All of these items are available for purchase in Hunter stores, an example being the shop in Yanille.
A good technique to capture them is to click one to begin hunting, then right clicking another. This way, you already have your next target without having to search, allowing you to hunt faster. Also, since butterflies respawn very quickly, another method is to camp a spot that spawns a butterfly with a small wander radius. This minimises the time spent running around.
A common strategy is to set up some bird snares while hunting ruby harvests, increasing the maximum experience gain.
One can use a jarred ruby harvest on another player to increase their Attack. This will only work in multi-combat zones, and only if the player is on your friends list.