Giiraegisir

These ivory cameos were popular among the wealthy citizens of Myth Drannor at the city's height. Giiraegisirs vary considerably in appearance based on the house of the original owner and the aesthetics of the creator. Each is basically an oval, ivory cameo with a metal pin on the back to secure it to the wearer's clothing. The ivory surface is engraved with some sign or glyph (a house insignia, a portrait of a loved one, or the like), and hidden within the setting (Search DC 20) is a small compartment that can hold an item of up to 2 cubic inches in size.
The cameo is affixed to the setting via a small, sliding track. Pulling the ivory cameo down on its track (a free action) grants the wearer a +5 deflection bonus to AC for 1 minute. This ability can be used once per day for the typical giiraegisir, but a few have a superior version of the effect that allows three uses per day of this function.
Moderate abjuration; CL 10th; Craft Wondrous Item, shield of faith; Price 10,600 gp (1/day) or 21,600 gp (3/day).
Source: Lost Empires of Faerûn