@vaccine: After reading the issue again, the ring most likely came from one of the lanterns killed by Volthoom when the GLC arrived. As Guy said, many lanterns fell then and there, so the ring Hal got was one of those.
Ah, that's probable. Thanks for the update. Appreciate it. It would make a whole lot of sense (and be kinda cool) if the FIRST ring went to Hal, though. :\