8.90 Carats Color Ultra Fire Opal Cabochon Gemstone

Item Information

Dimensions (mm) 14 x 14 x 6mm
Weight (carats) 8.9 carats
No Treatment

Opal is a hydrated amorphous form of silica (SiO2ยทnH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Opal is the national gemstone of Australia.[4]

Natural Opal

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$500.00 USD

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Audit Information

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Pricing & Details

Auction ID 1200523
Watchers 2 watching
Viewed 170 times
Starts 16th May 2020 10:16am PDT

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