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How Do You Determine If Jewelry Is Black Onyx Or Jet”?

April 26, 2017Black determine jet Jewelry onyx shopping

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How Do You Determine If Jewelry Is Black Onyx Or Jet”?

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True onyx is black with white (or tan) bands. Pure black onyx has been dyed. When mined, black onyx is actually a deep gray colored chalcedony (a type of quartz). The stone is then heat treated to achieve the desired jet color. Jet is the crystalline form of coal. It’s black, relatively soft 2.4-4, and takes a high polish. But it’s not as cool to the touch as black onyx.