Yes, rust is a concern. With gibeon meteorite it is the most rust resistant. These pieces are made with Muonionalusta meteorite, same type IVA fine octahedrite like Gibeon, just not quite as stable. After I do my etching to bring out to bring the widmanstatten patern I soak the meteorite in denatured alcohol for a while to displace any moisture. Methanol is best, just can't get it. After I let the alcohol evaporate off I coat it with a layer of ATM fluid or 3 in 1 oil. I let it sit for 24 hours. then wipe it off with a soft rag. I am very careful to keep my jewelry out of the rain or not wash my hands with it on or just keep it as dry as possible. It can be cleaned with CLR at the onset of any beginning signs of rusting then retreated. I do market my pieces and do my best to educate on wear and care. It definitely needs some extra TLC. I have had no rusting issues with any of the pieces I've done to this point.