Crystal for bathrooms, specified with the location rating the room requires.
Rating comes first
In the United States, a fixture near a tub or shower must carry the appropriate damp or wet location listing. That constraint is settled before design, not after. Tell us where in the room the fixture will hang and we will confirm what can be specified there before anything is drawn.
Crystal in a bathroom
Bathrooms are hard, reflective rooms, and crystal answers them well: it softens the light and gives a mirror-heavy space something to catch. Compact chandeliers and wall lights generally suit better than a large composition, unless the room has the height to carry one.