Precious opals are the most valuable gemstone in the world and the oldest. Since the earliest civilizations, the opal stone has been appreciated and referred to as an eye stone. Dating back to 4000 BC, the famous anthropologist, found the earliest known opal artifacts, believed to be originally from present day Ethiopia. Wearing a fire opal Australia is said to enhance the energy of Librans, because it acts as a mega-amplifier for their love.