Opal is a beautiful and individual kind of gemstone flaunting spectacular flashes of colour and depth. Shakespeare used the opal as a visual metaphore for indecisiveness in Twelfth Night - "The tailor make thy garment of changeable taffeta, for thy mind is very opal". Represents the zodiac sign Libra.Arabic folklore has suggested that opals came to the earth in thunderbolts of lightning. Opals can form in many colours in different parts of the world. Australia is known for its fabulous opals as is Ethiopia and Mexico is known for fire opals.