This is THE stone everyone should have for protection. This group of stones are variegated chalcedony, and the agate is one of the oldest stones in recorded history.
Agates attract strength, and is used for protection from bad dreams. It also protects from stress and energy drains. Agates have been used in jewelry since Biblical Babylonian times. They were used to ward off storms, as well as considered prized gems in antiquity. The agates with banded colors were placed at the head of a sleeper to give rich and varied dreams. Agates have also been thought to be good to harden the gums.