This mod replaces several weapons with the green sword the Emerald Weapon uses. I replaced Allagan weapons where I could and Shire weapons where I could not as they are relatively simple with few variants. Item Converter can place the appearance onto your desired weapon. The Red Mage and Samurai weapons use the off hands from the Emerald Rapier and Emerald Blade respectively.
Works for Paladins, Dark Knights, Samurai, Ninjas, and Red Mages.
*Couldn't find a picture that had the swords in it where they are green. Could only find gold depictions. So, just used a picture of the Emerald Weapon. If you've done the fight, you know what it looks like.