Just the other day I took out a knife from a sheath and the bolsters were full of verdigris ( the green corrosion that happens to brass). I knew the knife in the sheath was there for a short period. So then I checked another and same thing. I have hundreds of knives in cases and they have been there for months without any tarnish, I keep moisture packs in the cases and that could be why. So now I ordered 2 more cases to put the knives in and take the sheaths away. My very special one of a kind stone handle 110 and 112 go in a faux fur lined zippered canvas pouches. The knives are genuine stone, made by one of the best, and cannot be compared to any custom buck from the factory. The price was not a problem because each is solely unique. Some are semi-precious Jade slabs and Turquoise Slabs.
Daily wear and exposure to chemicals or salty water will tarnish the silver, then the plating will wear off and eventually the brass will start to exhibit that green substance called verdigris. The fact is, plating won't last.