Cleaning/Rust Prevention

Keep your blade clean and dry.
Hand wash with warm soapy water and a (non-abrasive) sponge or cloth.
Don’t leave it soaking in water and NEVER put it in the dishwasher!
Dry your knife well a paper towel or soft cloth.
Oil the blade with a food-safe oil to protect the steel when not in use.
A patina (varied discoloration) will develop on your blade over time, especially when exposed to acidic substances. This is normal and gives the blade character.

Keeping it Sharp

A frequently honed blade will rarely need sharpening.
Use a leather strop or a ceramic honing rod to touch up your edge at the first sign of dulling. This process re-aligns the edge on a microscopic level, returning it to sharp without having to grind off any material.
If your blade needs a solid sharpening, use a whetstone and NEVER a pull-thru sharpener! Those things ruin edges and will require a professional sharpening to get it back to true.
Proper honing and sharpening will greatly increase the lifespan of your blade and keep it working exactly as it should.

As iron and steel are prone to rust, keep your pendants and other forged jewelry items away from areas of high humidity such as bathrooms.
If rust does start to form, wipe it off with some fine steel wool lubricated with oil
Most forged pieces are protected with a coat of either axe wax, natural beeswax or boiled linseed oil, which helps to mitigate rust, but a quick wipe-down with any oil helps to coat the surface and protect it during prolonged storage.
For antler/bone jewelry, these materials can become bleached if left in direct sunlight for prolonged periods of time.
If antler/bone becomes sun-bleached, they get more brittle and could potentially crack under pressure.
You may choose to rub a light coat of wax or oil into the antler/bone to protect it from drying out and give it a good shine.