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Crystal of adamant armor, lesser

(Magic Item Compendium, page 24)

Price (Item Level): 1,400 gp (5th)
Body Slot: — (armor or shield crystal)
Caster Level: 9th
Aura: Moderate; (DC 19) transmutation
Activation:
Weight:

This clasp holds a small diamond orb with a sphere of steel at its center.

A crystal of adamant armor strengthens your armor or shield against damage.
This augment crystal improves the hardness of a suit of armor or shield by 5.

Prerequisites: Craft Magic Arms and Armor, diamondsteel (SC 64).
Cost to Create: 500 gp (plus 400 gp for base item), 40 XP, 1 day.