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6.42 CTS SAPPHIRE CRYSTALS SIR LANKA [MGW3599]

UGS
Dimensions (mm)
18.000 x 7.000 x 6.000mm
Poids (cts)
Certified Gemstones
Non
Treatment
No Treatment, Heat Treatment, Beryllium Treatment, Surface Diffusion
Taper
Rough
Couleurs

IMPORTANT NOTE: This item contains fissure filled cavities that may contain glass, cobalt, or other materials. Due to the presence of these materials, this item should be referred to as a composite stone.

 SAPPHIRE ROUGH CRYSTAL

 

 This is a specimen of natural untreated sapphire crystal from Sir Lanka .

It was selected due to it well formed crystal formations.Great specimen.

 

Weight 6.42 cts app

 

Size 18 x 7 x 6 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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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
:ville Pays
Vérifié
: Retour total

8.00%
Code promo GEMSONSALE
Valable jusque
21st Apr 2024

Audit

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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 : 376465
Départs : 28th March 2024 03:00 am PDT
* Tous les prix sont en :devise