Opal is a semi- precious gemstone belongs to silicate mineral family. In astrology it is considered substitute of diamond. It is mainly wear for luxury life and high social and financial status, a happy married life and good health. It’s a birthstone for October. It can be worn by anyone but is more beneficial for Libra and taurus. Opal comes in different colours and different shapes. There are two types of opal one is fire opal and another is without fire opal. The best quality of opal is found in Mexico and australia. For astrology fire opal is more preferable.