Rapid-Rina

Many traditional jewellery boxes feature a miniature ballerina figure who twirls around slowly to some musical accompaniment when the lid is opened. (see link)

I see an opportunity here for madame ballerina to do something much more useful, that being to assist in the cleaning of the items in the box. Here's how this can be achieved:

On removing an item to be worn and finding it perhaps a little dulled through neglect, the prospective wearer presses the discrete "cleaning" button on the box. A protective curtain rises around the little ballerina covering her up, apart from a slot at the front through which the ring or other item to be cleaned can be inserted and held in place.

The normally demure ballerina now accelerates to full operating speed, her tutu dress rising up to become a polishing disk, against which the jewellery is held until it's buffed to a sparkling shine once again. She is now in full Rapid-Rina mode. A simple knob controls the rotational velocity.

A range of the tutu dresses that double up as cleaning disks are held in a storage area under the box, along with protective gloves and a jar of jeweller's rouge. (note cleaning disks are technically called "mops" in the world of jewellery)

On completion of the cleaning process, the protective screen retracts into its slot, revealing the ballerina again, who's dress may be changed to that of a more decorative one for display purposes.