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$20.00
Current Bid
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Closed
12/03/2018 05:16 pm
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70.9 CTS OPALITE ROUGH BRAZIL [VS6438 ]

SKU
Dimensions (mm)
x x mm
Weight (cts)
Type
Rough
Colours

VOLCANIC OPALS

CATS EYE OPAL ROUGH

This is a green natural untreated rough specimen from Brazil showing chatoyance [cats eye] effect.We have selected this piece as it has a strong cats eye effect.Beautiful irresdant display making it a pleasure to polish.

Hardness mohs scale 5.5 to 6.5

Natural untreated rough

Weight 70.9 cts app

Size 36X27X17 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.

Shipping provider Shipping to Australia Shipping to rest of world
FedEx $12.00 / 3 days $39.00 / 10 days
Australia
FedEx is discounted to $12.00 on orders with 2 or more items
Rest of the world
FedEx is discounted to $39.00 on orders with 2 or more items
Registered Shipping $9.00 / 7 days $16.00 / 21 days
Australia
Registered Shipping is discounted to $9.00 on orders with 2 or more items
Rest of the world
Registered Shipping is discounted to $16.00 on orders with 2 or more items

quality rough
quality rough
The owner Paul Sedawie is the current president of the Opal Association.All my life i have enjoyed collecting minerals and fossils .I have been opal mining and now have a large opalized fossil collection of museum quality.I enjoy visiting mines in different parts of the world and try to buy direct off the miner or as close to the source as possible to give you the best deals.Natural stones/minerals fascinate me so I don�t stock laboratory made stones.I have a few sites here which I head under the Seda group.I believe that your continued business is my business so I hope you enjoy the amazing array and beauty of nature I have to offer.Best Regards Paul Sedawie We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
Lightning Ridge, Australia
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8623 Feedback

  • tr3y003
    tr3y003
    Positive

    A+ seller great looking piece

  • kylea
    kylea
    Positive

    Paid and shipped - no feedback left after 100 days

  • chris47
    chris47
    Positive

    The stone is very beautiful. Im really looking forward to cut it. Its always a pleasure to make business with you

  • chris47
    chris47
    Positive

    The stone is very beautiful. Its always a pleasure to make business with you

  • chris47
    chris47
    Positive

    The stones are very beautiful. Im really looking forward to cut them. Its always a pleasure to make business with you

Bids History (1)
wrenstormbringer
Purchased from this seller previously
6 years ago
$19.00

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Shipping Details

Shipping:
$16.00 21 days via Registered Shipping
Ships from:
Australia

Payment Options

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  • stripe
This seller adds 10.00% tax to transactions in Australia.

Overview

Listing Type : Standard
Product ID : 428808
Starting Bid : $19
Starts : 10th March 2018 10:45 am AEST
Ends : 13th March 2018 10:16 am AEST
* All prices are in USD