|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
SAPPHIRE ROUGH CRYSTAL
This is a natural untreated specimen from the congo Africa .Great specimen.
Weight 30.50 cts app
Size 22 x 13 x 10 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.
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.
Nice polish, brighter in the picture but still beautiful, rough on the bottom, very pretty, fast shipping and speedy service, thank you.125 CTS LARGE LABRADORITE POLISHED SLAB [MGW 2323 ]
Wow, SO beautiful, as per usual the shipping and customer service were excellent and I can't wait to make a creation with this gorgeous piece.29.15 CTS OPAL FLUORITE 'TIFFANY STONE' [MGW707]
|Starts||14th Jan 2018 9:00pm PST|
|Ends||17th Jan 2018 9:00pm PST|
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