Blue Nile Glossary
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  Varieties of quartz range from translucent aqua blue to opaque black. The most common varieties of quartz are amethyst, citrine, and black onyx. For best care, avoid sharp blows, which can damage even the toughest gem, and keep your quartz away from extreme heat and temperature changes.

See also: Amethyst, Citrine, Black Onyx, Gemstone Education.


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