Random Magic Wondrous Item
Pearl of power (8th-level spell)
This seemingly normal pearl of average size and luster is a potent aid to all spell-casters who prepare spells (clerics,, druids, rangers, paladins, and wizards). Once per day on command, a pearl of power enables the possessor to recall any one spell that she had prepared and then cast. The spell is then prepared again, just as if it hadn't been cast. The spell must be of a particular level, depending on the pearl.
Caster Level: 17th
Prerequisites: Craft Wondrous Item, creator must be able to cast spells of the spell level to be recalled
Market Price: 81,000 gp; weight: -.