Polymer Clay earrings are fairly durable.  They have some “give” to them.   Still, they are clay so be careful not to bend them or too much or they may break.  If you happen to get make-up on them, lightly buff with a soft cloth.  Need a little more than a buff?  Witch Hazel on a soft cloth does the job.  Want a little shine to the matt finish?  A small dab of furniture polish on a soft rag does the trick.