Mexican Opals are known for their vivid yellow, orange or orange-red colors. The intense color has earned this gem the nickname fire opal. Unlike precious opal, the Mexican Opal does not usually exhibit a play of color. But it makes up for this with its remarkable body color. It is the few varieties of opal that can successfully be faceted, as some specimens can exhibit considerable transparency.

The prices and value of Mexican Opal vary according to the size and quality of the gemstone.  The vivid orange and red colors are the most valuable, while the paler yellow and white tend to be less expensive. Transparent specimens are rare and valuable.