Gypsies use the pendulum quite a lot. One of the uses to which they put it is in determining whether or not a particular lover is the right one for you. The pendulum itself should be a ring suspended on a length of red silk thread or ribbon.
Many girls use their mother's wedding band for the ring.
The only other thing you need is a connection with the one you are wondering about. This can be an article of his or her clothing, a handkerchief, a watch, ring, or other piece of jewelry, a photograph, or anything similar that has a direct link with the person. Simply sit with the object, photograph, or whatever in front of you and hold the pendulum over it. It doesn't matter whether or not your elbow rests on the table, but hold the thread so that the ring is suspended about an inch or so above the object. Allow seven inches of the thread between your fingers and the ring.