This magical ring was able to summon a particular genie from its elemental plane. Each ring summoned either a genie or a noble genie. A summoned genie served the owner of the ring loyally until the genie was slain. The ring would become an ordinary ring upon the death of the genie. Summoned noble genies left their master's service after granting three wishes.
If a sha'ir was powerful enough, she or he could free regular genies from the ring and were sometimes granted a wish that was free from any obligation.