• Wipe your jewelry with a soft cloth after each wear to remove any sweat, etc. to help reduce tarnishing over time. You may use the polishing cloth provided to remove any tarnishing that may occur.
• Clean all metal parts of your jewelry from time to time with isopropyl/rubbing alcohol (not water) and wipe dry right after. 
• Store your jewelry away from sunlight in a ziplock bag or any airtight container to reduce the amount of exposure to oxygen and moisture. If you can acquire silica gel packets (which can be found in certain food packages) or anti-tarnish strips and place them into the ziplock bag or container, that would be ideal.
• Do not get any hair products, perfume, water, etc. on your jewelry.

This will prolong the lifespan/shine of them so it's pretty important! Applies to most jewelry in general.

Specifically for polymer clay jewelry:

• Although polymer clay is durable and flexible to some extent, please avoid bending it a lot or storing it in places like your bags, filled drawers, etc. because this might cause them to break. Especially if your jewelry has thinner components.
• Store all polymer clay jewelry by hanging them or placing them in boxes or any place where they run no risk of being bent or squashed accidentally.
• If your jewelry is of a lighter color, it is normal that there may be stains on the clay over time after wearing them, especially if you wear makeup.
• If your jewelry is stained, simply use a soft cloth or cotton buds and wipe over that area gently with isopropyl/rubbing alcohol. If this doesn’t remove the stain entirely, you may use a bit of acetone or nail polish remover too. But be extra careful if you choose to use acetone or nail polish remover because it may damage the clay surface if you’re not gentle with it.

Specifically for beaded jewelry:

• Store all beaded jewelry by hanging them or placing them flat in boxes or any place where they run no risk of being bent accidentally.
• Although the beading wire I use is strong, durable and maintains its shape well over time, any beaded jewelry should still be stored properly to ensure its longevity.