Pretty Orb is an accessory that provides +4 Defense, +4 Magic Defense, and prevents Slow. In addition, when two are used on a creature, it can learn Slowproof. It can be bought for 4,000 gil at Bikanel or 1,000 credits at Open Air, Inc. (requires Publicity level 4 or higher), dropped from Haizhe (Oversoul), Anole (rare), and Aka Manah, stolen from Haizhe (rare), bribed from Haizhe (2,612 gil) and Boris (2,000 gil; rare), or by dispatching a level 5 Chocobo to Zanarkand.
Glass Orb is an accessory that grants resistance to Slow by 30-45%, depending on it's level, and upgrades to the Dragonfly Orb by using the Perovskite item. Two Glass Orbs can be found on the fourth tier of Taejin's Tower, and they can also be bought from B&W Outfitters after chapter 5 for 3000 gil.