A fine Fire Agate should look a lot like a fire Opal, this piece does, it is an impressive example. This has very bright fire colors with red, green, blue purple and yellow flashing colors, far better in person. These colors come from inclusions of iridescent Hematite in the clear parts of the Chalcedony. A top grade Fire Agate that has a polished facing surface and is sawn on the back, 17 grams. Fire agate of average grade is currently plentiful but this quality is not, and is often nearly as expensive as Opal.