Jasper was used in ancient Egypt as an amulet, the sacred 'Scarab' beetle was often carved from this stone. In the Middle Ages it was considered the stone of Warriors and was often found set into the hilt of a sword, to offer protection on the battlefield. It is still associated with courage and protection today, with the reds being the most 'feisty'. Yellow Jasper is associated especially with protection during travel and with protection during spiritual work.
Yellow Jasper stimulates the Solar Plexus Chakra (3rd) and aids digestion, eases stomach complaints and helps with the release of toxins.