I’ve got a piece of jewelry that I want to clean up to give to someone to wear.
It’s a Jade broach, about an inch square.
In general, jade is easy to take care of. You can even wear the jade item while taking a shower.
Jade Cleaning: Clean jade with warm water and little mild soap or detergent.
Use a soft brush to clean away dirt if necessary.
Virtually all jade is waxed; most of it these days is dyed and/or polymer impregnated. So while jade itself is one of the toughest gem materials in existence, the treatments that may have improved its appearance are not. I would stick with mild soap and water, which ought to be enough. Jewelry cleaner will strip off the wax and may damage the polymer coating, if any.