The LINKING RINGS is a classic of magic. Upon inspection you will notice two of the rings are welded together and cannot be taken apart. You are also supplied with one normal ring and a gimmicked ring with a whole (gap).
The concept to perform this illusion is to make sure at all times that your hand is covering the secret gap. By moving your hands swiftly with the rings held tightly you can make the rings link by touching the hole (gap) to any of the rings.
The gimmicked pair that are welded together can be given held in your hands at the start of the illusion and you can blow over them and say magic words to MAKE THEM LINK! These can be inspected.
The best way to routine this trick into an amazing performance is to watch the videos below for some ideas on presentation.