This dun and ecru diamond is incredibly durable.

The least version of this augment crystal grants you damage reduction 3/—. This damage reduction stacks with similar damage reduction granted by any other source. Once the clasp has prevented a total of 30 points of damage, it becomes inert until the following day. A lesser iron ward diamond functions only when attached to medium or heavy armor.
An iron ward diamond lends its toughness to armor, helping it absorb blows in combat.

Prerequisites: Craft Magic Arms and Armor, stoneskin.
Cost to Create: 1,000 gp, 80 XP, 2 days.