6.10 Carats Full Fire Opal Cabochon

Item Information

Dimensions (mm) 18 x 10 x 9mm
Weight (carats) 6.1 carats
Colors
No Treatment

Opal is a hydrated amorphous form of silica (SiO2·nH2O); 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.


There are two broad classes of opal: precious and common. Precious opal displays play-of-color (iridescence), common opal does not.[4] Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light."[5] The internal structure of precious opal causes it to diffract light, resulting in play-of-color. Depending on the conditions in which it formed, opal may be transparent, translucent, or opaque and the background color may be white, black, or nearly any color of the visual spectrum. Black opal is considered to be the rarest, whereas white, gray, and green are the most common.


Opal Cab

Paypal Accepted

$399.00 USD

Audit Information

The Gemstone Sheriff program allows our members to request an audit on any auction, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.

Pricing & Details

Auction ID 1322722
Watchers 0 watching
Viewed 137 times
Starts 24th Oct 2020 1:13pm PDT

Shipping & Insurance

Provider Shipping Transit
DHL $30.00 10 days
Standard Shipping - Tracked $16.00 25 days
Shipping Insurance all providers $10.00 (optional)

About Gems4selling

You May Also Like