When these two elements are brought together, you?re able to make decisions using all the sources, rather than just one of them.
Many people choose to use a crystal pendulum. Clear quartz, for example, is a popular choice, as the crystal is associated with clarity. Another choice is Amethyst, which has a strong connection with the spirits and is very popular since it has the calming properties of a rose quartz crystal. But really, the material is secondary and what primarily matters is that it should be rounded or tapering towards one end.