This leather circlet has a silver headpiece showing crescent moons on either side of a seven-pointed star.

A circlet of mages grants you a +2 competence bonus on Concentration checks. This is a continuous effect and requires no activation.
In addition, this circlet has 3 charges, which are renewed each day at dawn.
Spending 1 or more charges when you cast a spell allows you to avoid losing that prepared spell or spell slot (as if you hadn’t cast it).
1 charge: Retain a spell of up to 1st level.
2 charges: Retain a spell of up to 2nd level.
3 charges: Retain a spell of up to 3rd level.

Prerequisites: Craft Wondrous Item, Rary’s mnemonic enhancer.
Cost to Create: 2,500 gp, 200 XP, 5 days.