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Actually, that isn't true. Any construct made from the ring of any lantern is made from "Emotional Electromagnetic Energy" as opposed to normal materials. The same way that if a lantern makes a fighter jet, it isn't made out of normal fighter jet materials. The only instance of a green lantern creating any non-willpower material from their ring that I can find is from 1981, four years before the Crisis on Infinite Earths, and thus, a full 31 flavors of non-canon. While it isn't precisely clear when in DC's history this RP is set, it seems to lean more towards the recent, with Cyborg as a major player in the Justice League.
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Also, my complete inability to find any examples of this that aren't from a cover lead me to believe that even the instance show isn't something that can be referenced, and is instead most likely an example of "
Super Dickery" which was a common trick to sell comics for several decades.
In addendum: I have way too much free time, but GL Corps rings are not able to mimic the effects of Kryptonite. Unless it would make DC some extra dough, that is.