But It Can & Will Make A Big Difference.ONYXOnyx can be lit from behind......Do you have a powder room you would like to be truly special ?Take a chest like this,or this,or this, or even this... then you top it with onyx, drop in a sink (or two, if the size is right for a master bath) with beautiful hardware, and you are set ! Now , hang a fabulous mirror over the sink, hang a set of sconces on