One of the stones in the breast plate of the high priest. Jasper is a powerful protection and grounding stone, used to align the energy of the chakras for astral journeys. Specifically placed over the hear and navel chakras prior to astral travel. The placement and effect varies somewhat with the color.
Yellow jasper stimulates the heart area.
Red is used for bronchial problems. Brown is for grounding, and green jasper has overall healing effects when worn or held. Jasper is also used in drowsing.