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653 CTS LARGE SAPPHIRE SPECIMEN FROM BURMA [MX 10030]

SKU
Afmetingen (mm)
x x mm
Gewicht (cts)
Certified Gemstones
Nee
Type
Specimen
Kleuren

 SAPPHIRE ROUGH CRYSTAL SPECIMEN

 This is a natural untreated specimen from Myanmar[BURMA].Great specimen and showing some spinel crystals.

 

Weight 653  cts app

 

Size  78X56X27 mm app

 

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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sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
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  • royrock
    royrock
    Positief

    Beautiful agate piece , and as always fast efficient service from Sedagems

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Overzicht

Vermeldingstype : Standard
Product-ID : 246662
Begint : 21st November 2024 03:55 pm PST
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