Care & Maintenance
I recommend storing your jewelry in a soft, protected environment as it can be scratched by other hard items and glass can break. (I know, shocking!) Most smaller items would actually be difficult to break, but larger pieces such as statement rings, bar pendants and home accessories, are more at risk. If you travel with KK pieces, wrap them in something soft then pack snug within a firm-sided box or case. To clean, wipe with any microfiber cloth. To really make it shine, wipe with rubbing alcohol and a lint-free cloth.
Avoid tarnish build-up on your sterling silver jewelry by wearing your pieces often. When not wearing them, store them in a soft, low-oxygen environment, such as a flannel jewelry bag. Frequent and/or intense exposure to grooming and cleaning products can be hard on metal finishes and can contribute to tarnishing. Silver elements can be polished with a silver cloth, but a lint-free flannel, microfiber, or other soft, nonabrasive cloth will do as well. (Paper towels and tissues aren't recommended as they contain fibers that can scratch.)
The leather I use is meant to age with time. You can try to gently spot clean a glaring issue with a very small amount of mild dishwashing soap and water. Just be aware that sometimes "the medicine is worse than the ailment", meaning the attempt to clean could result in a different type of unevenness. Over time most scratches and minor spots will recede as the entire piece of leather develops it's own character. Enjoy the way your wearing of the item further customizes the piece for you!