I do believe that even Corning states in a marketing video they made that the GG2 is no different than GG1, only thinner. The GG2 is .08 mm, as compared to 1.0 mm or thicker on the original GG.
Watching another video just today from a NBC article, if i remember correctly, stated that the glass is made a certain way to give it a tempered quality. They do this by immersing the glass in a chemical solution and boil it at high temps, then remove the glass from the bath and cool it with a cold rinse, "hardening" the outer layers, but leaving the inner layer to be slightly pliable, allowing for some flex in the core of the glass. Now say for instance, the original GG at 1.0 mm thick has .04 mm top and bottom hard surfaces, with .02 mm flex glass in the middle. .04 + .04 + .02 = 1.0. Now they make the GG2 and are constrained to .08 mm glass. We now have something like .03 mm top and bottom and .02 mm in the middle. There is still flex, just not as thick on the outer flats.
These could very well be some sort of stress cracks, instead of scratches (one earlier poster called them possible fissures).
All I can say is that i pocket my sgs3 with another phone on a daily basis and no screen protector. Am i tempting fate? Who knows. All i know is that i have no scratches yet, and if i do, then i will stop worrying about potential resale value. I have had my white sgs3 since launch day with only a Belkin grip vue case, i think that is what it is called, covering it's bottom side.
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