Sardonyx is a very striking stone with an incredibly varied range of patterns and colours. It is said to enhance strength and willpower and to increase stamina, vigor, self-control and self-confidence. Sardonyx can be a useful stone to keep by you when you are learning new things as it is believed to aid the processing and absorption of new information. Beautiful and useful too! Pendulums are used much the same way as applied kinesiology or muscle testing to help determine the answer to a question. Pendulum chain not shown in photo.