Melissa Joy Manning 18K Gold Bezel Set Opal Ring Size 6 and a HalfOpal is a hydrated silica mineral with a hardness of 5.5 to 6.5. Some, but not all, Opals exhibit the play of colors knows as 'fire.' This is caused by the Opal's minute silica spheres being packed in a formation regular enough to cause light diffraction. White Opal is the best-known Opal and the most most widely used in jewelry. The bulk of White Opals come from Australia, but deposits have been found in Brazil, Guatemala, Honduras, Japan and the United States.
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