how often should the jewelry be inspected/polished/cleaned?

[lilybride]

I was wondering, how many often should I get my rings fixed? My rings are in very good condition, but should I at least take them to the jeweler to see that the diamonds aren't loose or there isn't any other problems. I have my own ultrasonic washer where I was my jewelry at least monthly (I use a lot of lotions and makeup and wash my hands all the time, so the ring would be covered with all of these if I would own the machine)

Any other thoughts how to keep jewelry as pretty and in good shape?