Restores HP. It cannot be used in the field. Equip as an Add-on.
Ruby is an item and an Add-on found at the Iifa Tree or bought from Stiltzkin in Alexandria on disc 4. It teaches the abilities Carbuncle and Reflect, and when used as an item, restores HP equal to the number of Ruby in the player's inventory x60. It is advised to not use the Ruby as an item, as there are only two in the game.
The Ruby is used in the creation of various mid-to-high-level equipment (around level 60-70) by high-ranking crafters. It is especially important in the crafting of the Puppetteer's Artifact Armor. When made into a ring or an earring with Goldsmithing, the ruby allows the item to enhance the power of Fire. The gem is rare to find, with many coming from the slaying of the Ruby Quadav Notorious Monster.