All one has to do is hold the crystal pendant over a map of the area where it is thought the lost person or object will be. The more violent and vigorous the swing of the pendant, the closer you are to the object on the map coordinates, like a "warm or cold" method of looking for something i.e. the more vigorous the swings the "warmer" one is. The pendant will eventually pinpoint the exact location of the object or person by pulling down on to a spot on the map after a certain amount of time.

For a scry to pinpoint the exact location of something, usually an item of that person or demon is needed, like clothes or blood. Amethyst is said to work best as the most powerful scrying substance.