Opal
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Opal
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Cultural Significance
About Opal
Opal is a hydrated amorphous silica (SiO₂·nH₂O) celebrated for play-of-color—a spectral shifting display of red, green, blue, and gold caused by diffraction of light through ordered arrays of silica spheres within the stone. Australia produces approximately 90% of the world's precious opal, including white opal from Coober Pedy, black opal from Lightning Ridge, and boulder opal from Queensland; significant sources also include Ethiopia and Mexico. Revered since antiquity and October's birthstone, fine black opal with red fire is among the most valuable colored gemstones per carat.