The fire opal is regarded as the national gemstone of Mexico due to the fact that the most significant fire opal deposits in the world lie in Mexico. However, Mexican Fire Opal beads in orange-red-yellow are a fiery play of color are found in other countries such as Honduras, Guatemala, the USA, Canada, Australia, Ethiopia, Turkey and Brazil. Brazilian Fire Opal mined in the South Brazilian State of Rio Grande del Sul distinguish themselves by their slight clouding, their yellow to orange color, their lack of play of color (as a common opal) and their large size. The color in all Fire Opal comes from fine traces of iron oxide. Transparency can range from transparent to semi-translucent and is based on water content during the stones formation. The tolerance of the fire opal to extreme heat is poor. Like all opals, it should not be exposed to intense light over long periods because of the drying effect. Fire Opal loves to be worn a lot, since this enables it to maintain its water balance, using the moisture of the wearer`s skin and that of the air. Play of color, body color and transparency are the three criteria which determine the price of a fire opal. Clean your Fire Opal using a slightly damp, soft cloth.