Because opal has the colors of other gems, ancient Romans thought it was the most precious and powerful of all gemstones and called in the Queen of Gems. The Bedouins believed that opals contained lightening and fell from the sky during thunderstorms. Opal is prized for its unique play of color, the ability to disperse light into flashes of rainbow colors.
Writers have compared opals to volcanoes, galaxies and fireworks. Those born in October are lucky enough to claim it as their birthstone. Opal's are considered symbols of hope, fidelity and purity.
Opal is the product of seasonal rains that drenched dry ground in regions such as Australia's semi-desert outback. The showers soaked deep into ancient underground rock, carrying dissolved silica (a compound of silicon and oxygen) downward. During dry periods, much of the water evaporated leaving solid deposits of silica in the cracks and between layers of underground sedimentary rock. These silica deposits formed opal. 
Because opal's have a high water content - the composition of opals is up to 30% water - they should never be stored in airtight containers, such as safety deposit boxes. This can cause a loss of moisture cause damage. Opals thrive when worn. Opals are softer than other gemstones and should be treated with care. They should be worn and stored carefully to prevent scratching and to protect them from hard blows. Opals should not be exposed to heat, acid or any cleaning solution. They should be cleaned with a soft cloth only.
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