This is a nice little trick. You will need a glass that fits into the gimmick. The only issue I have with this, is it seems like a bit of a throw-away trick. I can't figure out how to make it part of something more entertaining. It doesn't really engage the participant in anything other than "Hey, do you want to see something interesting?" I prefer effects that engage the audience in some way. I would say that this would be a good thing to have laying about the office or home and wait for someone to ask what it is. Perhaps you could tell them that it came from a chinese secret lab and use it to make a chinese coin appear.
I don't know, I'm grasping..
All in all, not bad.