From Elemental Lords of Porphyra

Faceted Prison
Aura moderate summoning; CL 5th; Weight
Slot none; Price 2,500 gp
These sandworn, crystalline gems appear similar to other elemental gems, but are only capable of holding small elementals. Unlike elemental gems, however, a faceted prison can also ensnare and imprison a small elemental within 30 ft., if it fails a DC 15 Will save; thus it can be reused. There is an equal chance of a faceted prison, when found, to be empty or containing a prisoner. Releasing or capturing a small elemental is a full-round action.
Requirements Craft Wondrous Item, summon nature’s ally II or summon monster II; Cost 1,250 gp