Personally, I think the shots are really great, if a little under exposed, as others have mentioned.
May I ask, what size of light box are you using?
I'm trying to take good shots with a Canon G12, used to have a Canon A650 and the results are similar withthe old camera. I'm pretty sure it is just me, but I have all sorts of trouble trying to take the shots and avoid the reflections of either my hands, the camera or both.
cheers
richard.
PS. the image of the omega logo on the crystal, sensational.