Brooch — is a unique accessory that has its own slot in the inventory. Brooch slot can be filled with jewels that give various buffs.
All brooches and jewels are No-Grade items.
Brooches unlock jewel slots when they are equipped in an appropriate slot. Depending on brooch's level, it can unlock to 6 slots.
Unlocked slots can be filled with jewels which grant various buffs
To install a jewel, equip a brooch, then double-click on a jewel in your inventory (or press RMB