Bynarr's pendant was an amulet that had a removable crystal that was used as a key to access the Transportation rings on the moon of Netu to the planet Delmak.
The pendant had the shape of an upside-down star with a red crystal in its center. The pendant was worn by Bynarr, the Lord of Netu. Its crystal was used by Jolinar of Malkshur to escape Netu. (SG1: "Jolinar's Memories")