Locket of Saint Jiub

 is an amulet found in.

Enchantment
The amulet is counted as Light Armor, and boosts carrying capacity and stamina by 50 points as well as armor rating based on Light Armor skill.

Acquisition
It is granted to the Dragonborn by Jiub after completing Impatience of a Saint by finding all of the pages of Jiub's Opus in the Soul Cairn. In addition to the amulet, a finished copy of his Opus is also rewarded.