Vanishing ring black by SansMinds
You are looking at what is probably the cleverest ring box that has ever been constructed. Imagine the following process: you show a beautiful, elegant ring box, the viewer can examine it, even if it is completely unnecessary. A spectator puts her ring in the box herself and closes the lid, safe!
But all you have to do is take the box and give it to another spectator for safekeeping and you are immediately in possession of the precious finger jewelery - so quickly that no one can even suspect it. The box stays closed the whole time. Now, of course, you make the ring reappear in the most incredible place possible!