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Under magnification, this opal displays its colorful natural honeycomb pattern. - Photo by Patricia Maddison/GIA
The play-of-color really stands out in this orange fire opal from Mexico. - Photo by Dr. E. J. Gübelin/GIA
Believe it or not, this is not a stained glass window – it is actually wood that converted to opal as it petrified. - Photo by Nathan Renfro/GIA

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