Gemstones have long been appreciated for their spiritual strength and much like birthstones soon certain gemstones began to be associated with particular zodiac star signs. Mystics and shamans believe that each stone has its own unique character and abilities too. Amber aquamarine blue chalcedony bronzite cacholong clear quartz citrine dalmatian jasper diamond hawk s eye herkimer diamond pearl labradorite moonstone rainbow obsidian rainbow fluorite serpentine tiger s eye turquoise white noble opal yellow citrine silver.