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$101.00
Current Bid
1
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Closed
30/12/2018 08:23 am
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25.15 CTS SRI LANKAN SAPPHIRE SPECIMEN [MGW5349]

SKU
Dimensions (mm)
29.000 x 18.000 x 7.000mm
Weight (cts)
25.150
Type
Specimen
Colours

SAPPHIRE ROUGH SPECIMEN

 

This is a specimen of natural untreated sapphire crystal from Sri lanka that i bought on my last trip there. .

 

.Great specimen.with good formation

 

The weights and size below  is approximate.

 

Sapphire is one of the two gem varieties of the species corundum. Although blue is the best known hue, the gem occurs in virtually every spectral hue excepting red. Red corundum is a ruby. Sapphire may also be colorless, and it also occurs in the non-spectral shades, gray and black. Yellow and green sapphires have traces of iron that gives them their color. Pink sapphires have a trace of the element chromium and the deeper the color pink the higher their monetary value as long as the color is going toward the red of rubies. Sapphires also occur in shades of orange and brown, and colorless sapphires are sometimes used as diamond substitutes in jewelry. Salmon-color padparadscha sapphires often fetch higher prices than many of even the finest blue sapphires.

 

Treatments

 

Some natural sapphires are heated to improve or enhance color. This is usually done by heating the sapphires to temperatures of up to 1800 °C for several hours, or by heating in a nitrogen deficient atmosphere oven for seven days or more. On magnification, the silk due to included rutile needles are often visible. If the needles are unbroken, then the stone was not heated; if the silk is not visible then the stone was heated adequately. If the silk is partially broken, then a process known as low tube heat may have been used. Low tube heat is the process whereby the rough stone is heated to 1300 °C over charcoal for 20 to 30 minutes. This removes grey or brown in the stone and improves color saturation.

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Rest of the world
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mineralgemworld
mineralgemworld
MEMBER OF THE [ICA]  INTERNATIONAL COLOURED STONE ASSOCIATION AND PRESIDENT OF THE OPAL ASSOCIATION. 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
Surfers Paradise, Australia
Verified
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  • jaysello
    jaysello
    Positive

    I am 110% satisfied. Beautiful, deep blue color, very translucent & crystalline specimen. Reasonably priced. Highly recommend to other buyers.

Bids History (1)
jaysello
Purchased from this seller previously
5 years ago
$100.00

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Shipping Details

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

Payment Options

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This seller adds 10.00% tax to transactions in Australia.

Overview

Listing Type : Standard
Product ID : 843792
Estimated RRP : $350.00
Starting Bid : $100
Starts : 30th December 2018 04:15 pm AEST
Ends : 31st December 2018 02:23 am AEST
* All prices are in USD