Amulet of Natural Armor +3

Dungeon Master's Guide v.3.5 (DMG)Core (3.5)

Type: Magic Item
Price: 18,000 gp
Caster Level: 5
Aura: FaintTransmutation

This amulet, usually crafted from bone or beast scales, toughens the wearer’s body and flesh, giving him an enhancement bonus to his natural armor bonus of +3.