Amulet of Natural Armor and Heartstone

[GM Kyle]

Heartstone (Ex)
At 2nd level, a stonelord's flesh becomes progressively rockier. She gains a +1 natural armor bonus to AC and DR/adamantine equal to 1/2 her paladin level. The natural armor bonus increases by +1 at 6th level, and every four levels thereafter, to a maximum of +5 at 18th level. These benefits are halved when not touching the ground or a stone structure. This ability replaces divine grace.

Amulet of Natural Armor
This amulet, usually containing some type of magically preserved monster hide or other natural armor—such as bone, horn, carapace, or beast scales—toughens the wearer's body and flesh, giving him an enhancement bonus to his natural armor from +1 to +5, depending on the kind of amulet.

Does the Stonelord ability stack with the Amulet of Natural Armor?

[Rikkan]

Yes.

[Nefreet]

Yup. One is a Natural Armor bonus, and one is an enhancement bonus to your Natural Armor.

Like a Wildshaped Druid and Barkskin.

[GM Kyle]

I thought so. Thanks. Go-go Stonelord!