SRD:Ring of Protection
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Protection: This ring offers continual magical protection in the form of a deflection bonus of +1 to +5 to AC.
Faint abjuration; CL 5th; Forge Ring, shield of faith, caster must be of a level at least three times greater than the bonus of the ring; Price 2,000 gp (ring +1); 8,000 gp (ring +2); 18,000 gp (ring +3); 32,000 gp (ring +4); 50,000 gp (ring +5).