Dowsing or radiesthesia is believed to date back over six thousand years. The Egyptians and ancient Chinese were early practitioners. Each natural stone pendulum from Ancient Wisdom is attached to a chain approx 170mm long with a gemstone bead at the end. PLEASE NOTE - Some of these pendulums are handmade from a natural product. Because of this, the sizes of the gemstone pieces may vary. assortments are depended on current stock levels. assortments are at random and you may receive duplications. At a gem of a price.