I couldn't miss the chance to practice my drawing!
The Guard Ring provides 2 Defense, making no change to Attack or Magic, and carries the possibility of DEF Boost 1. It can be bought for 60 gil from the shop, or else made with the Band of Security scroll for 100 gil.
The Guard Ring returns as an accessory that provides 2 defense at level 1 and 4 defense at level 30, has two empty slots, and can be bought for 30 gil. When turned into a jewel, a level 3-9 Guard Ring makes a Fruity Nugget, level 10-19 makes a Guard Stone 1, and level 20-30 makes a Guard Stone 3.
The upgraded version, Block Ring, grants +20% Wall Rush Defense. It can be obtained at the shop by trading 1,800 gil, Protect Powder x3, and Protect Shard x2.
The Guard Ring is a rank S basic accessory, and provides Wall Rush Defense +5%. It can be obtained by trading 900 gil and Dragoon's Desire x3.