After this consideration, the colors seen and the pattern of the colors will also influence value. The pattern of the play of color also influences value. Generally large flashes and broad patterns are more rare and valuable than small pinfire patterns. In addition to Australia, a small quantity of precious opal is produced in Brazil. Mexico and the state of Oregon in the United States produce a volcanic opal called fire opal.
Fire opal is transparent opal ranging in color from colorless to yellow, orange, and red.
Sometimes it also shows play of color in addition to its bright orange body color. Low quality opal was recently discovered in Ethiopia. Opal is cut in Australia, Hong Kong, Mexico, Germany, and other places. Calibrated sizes are widely available in light opal, which is very popular with jewelry manufacturers around the world due to the beauty even of inexpensive pieces. Black opal is cut in free sizes due to its rarity and high value.