Pendulums have been used as a technique for searching out the invisible also known as Dowsing. Dowsing relies on the motion of the pointer, or the pendulums change in direction to answer our questions and guide us. The pendulum acts as receiver and transmitter from unseen influences and it communicates this wisdom with you. You can ask your pendulum yes and no questions which is usually the most straightforward way of using this tool of divination. 
Lapis  is considered a stone of manifestation, helping one to understand more fully what it is in life and what to focus on manifesting in order to achieve ones goals and spiritual purpose. Lapis helps you build and maintain boundaries.
Listing includes one pendulum