6" sterling silver chain and your choice of handles.
We like working with amethyst as it is a type of quartz and has a star tetrahedronal molecular structure which in itself balances energy so that you can get an accurate "read." Amethyst is the crystal of wisdom and it has a cooling energy. The color varies from pale to deep purple and the crystal pendulum length varies but is approximately 1" long. We've used sterling silver chain as that further solidifies the balancing energy of the crystal. An excellent all around pendulum, for beginning to advanced.
Handle choices carry their own balancing energies. The ones with ceramic beads are especially strong, the beads a resonant substance further clearing the energies around the issue to be dowsed.