SRD:Gem of Seeing

Gem of Seeing: This finely cut and polished stone is indistinguishable from an ordinary jewel in appearance. When it is gazed through, a gem of seeing enables the user to see as though she were affected by the true seeing spell. A gem of seeing can be used for as much as 30 minutes a day, divided up into periods of minutes or rounds as the user sees fit.

Moderate divination; CL 10th; Craft Wondrous Item, true seeing; Price 75,000 gp.