Blue Nile Glossary
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  This gemstone is composed of hydrated silica spheres which create a pattern of mini rainbows throughout the stone. It is also the birthstone of October. Because it is a relatively delicate gemstone, avoid sharp blows to your opal and keep it away from extreme heat. Opals have a 2-6% water content, so they should always be stored in a cool, protected place.

See also: Birthstone, Gemstone Education, Opal Jewelry.


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