Handmade jewelry is durable and requires general care.
Be sure to store your jewelry in a safe and dry place.
I would suggest that you keep your jewelry in the box or wrapping that it came in too preserve.
Brass is a metal that will experience oxidation over time.
Please use your polishing cloth to keep that same shine on your brass jewelry.
Also, you may use brass cleaner or steel wool to remove any tarnish or for a more brilliant shine.
Clay is durable, however you must not throw or be rough with materials.