- Opal gemstone is a mineraloid that ranges from clear through white, gray, red, yellow, green, shore, blue, magenta, brown, and black. Of these hues, red and black are the most rare and dear, whereas white and green are the most common. Fire opal, or Girasol, is a translucent to semi-opaque stone that is generally yellow to bright orange and sometimes nearly red and displays pleochroism which is an optical phenomenon in which grains of a rock appear to be different colors when observed at different angles. Opal is the traditional birthstone of the month of October.
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Opal Jewelry 
