Good Morning folks
WE/WAE & GEM's finishing is
Glass Bead Blasted. It is a pressurized deliberate processing of the steel - and cannot wear off by regular 'touching'. It can get scratched tho - and thus would need extra care in handling (aka don't keep in your pockets with other metallic objects). Yes, the same applies to even polished and brushed surfaces ~ but with this blasted surface the scratches become more pronounced, visible.
None of my WE/WAEs or GEMs have any discoloration or scratches. And yes, I've used them daily since nearly a year. WAEs for two years. But I baby them. Keep them 'only' in that pocket which has just a kerchief and nothing else. And when they're kept horizontally on the table - I ensure that there's a soft material under them, viz. a piece of paper.
This is a signature finish of MarkBugs. And there has been many discussions over the forums, for many years, to have an alternate finishing (viz. polished or brushed) but most of the folks agreed to keep it as it is.
As you're aware, the Beta Testing period of the GEM was one of the longest in the history of vape gears

And I'm not the only one who handled the prototypes. Ah yes, I'm the most vocal one

But none of us found any issues with the finishing of the GEMs. Btw, even the 'pricing' strategy was discussed with us by MarkBugs. Similarly
@petar k did it too, for the URBAs.