Originally posted by Kal of Krypton
I dont think it's destructable, but i do know that its weakness is yellow?
...which is true of every Lantern except Alan Scott, whose weakness is wood. Though the yellow weakness has been partially retconned (see "GL: Rebirth" story arc), and they can now overcome it, though it takes a greater effort than normal.
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depend on which green lantern you are talking about.
If you're talking about Green Lantern - Alan Scott, then no. His ring is part of him.
If you're talking about more recent Green Lanterns - then yes. It generally has to be destroyed by either by yellow energy, or someone with a much stronger will than that of the wearer