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. At Blue Nile, you'll find beautiful opal jewellery. Because it is a delicate stone, for best care avoid sharp blows, which can damage even the toughest gem, and keep your opal away from extreme heat. Be sure to store your opal jewellery in a cool, protected place.


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