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14.80 CTS 'CATS EYES' TAN OPALITE -IRIDESENT [VS5808 ]

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CATS EYE OPAL

This is a  green natural untreated stone from Brazil showing chatoyance [cats eye] effect.We have selected this piece as it has a strong cats eye effect.

Hardness mohs scale 5.5 to 6.5 

Well polished

High domed

Weight  14.80 cts app

size  25X21X6 mm app

 

 Chatoyancy  or chatoyance, is an optical reflectance effect seen in certain gemstones Coined from the French "oeil de chat", meaning "cat's eye", chatoyancy rises either from the fibrous structure of a material, as in tiger eye quartz, or from fibrous inclusions or cavities within the stone, as in cat's eye chrysoberyl The effect can be likened to the sheen off a spool of silk: the luminous streak of reflected light is always perpendicular to the direction of the fibres. For a gemstone to show this effect best it must be cut  cabochon, with the fibers or fibrous structures parallel to the base of the finished stone. Faceted stones are less likely to show the effect well.

Cats Eye Opal was  formed app  15 to 30 million years ago, during the tertiary period. Starting out as a liquid it seeped through sedimentary layers of earth, settling within impervious clays at a depth of 20 to 30 metres. Over the coarse of millions of years, the liquid slurry crystalized, becoming catseye opal.

Cats-Eye Opalite is a rare chatoyant form of Opal.  The attribute that gives this stone its popularity and name is the phenomena known as chatoyancy, also known in the gem trade as “the cat's eye effect”. The reason for this fascinating phenomenon is very fine inclusions within the stone. When a light source is directed on these inclusions it creates a bright strip that appears and runs perpendicular to the inclusions. This strip will then glide across the surface of the stone when turned over. Opalite Cats Eye can also occur in shades of  green yellow, red, white and black.

The physical structure of Opalite Cats Eye is unique. Tiny spheres of silicon dioxide form a pyramid shaped grid interspersed with water. Tiny natural faults in this grid cause the characteristic "play of color". The effect is similar to the rainbow colors displayed on a soap bubble, only much more dramatic.  The incredible play of color is exhibited by the gemstone due to the presence of small spheres in the silica gel that causes interference and refraction appearance. Silicon and oxygen chains are packed in the spheres and these are uneven in size and incoherent in concentration. These are set in a compact structures thus, when ray of light falls it dissects the light on its way through the stone resulting in the awesome color play. As per the size of the spheres within the structure, changeable colors of the gamut are diffracted. With the increase in the consistency of the spheres position, more intense and brilliant would be the color play. 

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sedaopals
sedaopals
Discover the magic of opals at SedaOpals, where every stone tells a unique story. Paul Sedawie, the heart and soul of SedaOpals, began his journey with a humble piece of boulder rough at 14, sparking a lifelong passion for these mesmerizing gemstones. With over 40 years in the opal industry, Paul’s dedication has taken him from the rugged landscapes of Lightning Ridge to prestigious gem shows around the world. Paul, a former president of the Opal Association and an author of several opal books, shares his vast knowledge and passion with enthusiasts globally. He’s even made the largest donation of opalized fossils and curiosities to the Australian Opal Centre at Lightning Ridge. At SedaOpals, Paul and his sons offer a meticulously curated collection of opals, each handpicked for its exceptional beauty and character. Whether you’re a seasoned collector or new to the world of opals, you’ll find a stunning array of black opals, boulder opals, and crystal opals to explore. Join us in celebrating the timeless beauty and craftsmanship of opals. Welcome to SedaOpals, where every opal is a piece of art.
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  • laurenlambert
    laurenlambert
    Positif

    The stone was more beautiful in person than in the photos. It arrived very quickly. I would definitely recommend this seller and would buy from him again.

  • fissure
    fissure
    Positif

    Always a pleasure to deal with you! Thanks for fast shipping :)

  • gbesch
    gbesch
    Positif

    Absolutely stunning multi-colored fire skitters across the surface as if the stone were alive. One of the most beautiful pieces of boulder opal I've ever purchased. Extremely pleased! Thanks!!!

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7th Nov 2024

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Les détails d'expédition

Expédition:
$16.00 :compter les jours via Registered Shipping
Expédié depuis:
Australia

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Aperçu

Type d'inscription : Standard
Identifiant du produit : 319835
Départs : 27th October 2024 10:00 pm PDT
* Tous les prix sont en :devise