Tourmaline Gemstones at The Ross Jewelry Company in Atlanta, Georgia.
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Tourmaline is generally thought of as green, but can be almost any color, indeed some
Tourmalines display two or more colors within the same crystal. Because of the naturally
occurring shape, tourmalines are often cut as long baguettes, emerald cuts, or ovals. Large
size Tourmalines are more relatively common compared with other gemstones, so they are ideal
for large jewelry pieces. As with all gemstones, the most attractive colors and qualities
are more expensive than lower qualities, and large desirable pieces are not inexpensive.
Coloration
As it is found in all spectrums of color, Tourmaline is often described as the "chameleon
gemstone". It is not surprising to find a fine tourmaline that mirrors the exact semblance
of other gemstones, such as emerald, ruby and sapphire. Some tourmaline crystals may even
appear as crystallized rainbows with several bands of color, ranging from the most brilliant
red to the deepest blue. Many refer to tourmaline as the "muses' stone", for they believe
that its imaginative colors contain inspirational powers which enable the mind of its
beholder to bring forth illimitable vision and creativity.
Tourmaline exists in more colors than any other gemstone. The most common color is a dark
green, but bright green chrome Tourmalines are seen, as are blue, red, pink, orange, yellow,
colorless, brown, violet and black. Strongly colored pink Tourmaline is sometimes called
Rubellite (see the separate listing for Rubellite).
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Chatoyancy
Chatoyancy or chatoyance, literally from French means cat's eye. Seen best in cat's eye
Chrysoberyl, but also found in a few other gemstones including Tourmaline.
Evaluation
Similar to the evaluation of other precious stones, the intensity of color and the clarity
of the gemstone are the most important considerations. Green chrome and Paraiba Tourmalines
are the most expensive color varieties, due to their spectacular beauty and rarity. Fine
Rubellites and multi-color stones will command moderate to high prices depending on the
intensity of their color and the existence of eye visible inclusions.
Technical Characteristics
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Chemical Composition:
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Complex Aluminium Borosilicate
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Hardness:
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7.0 - 7.5
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Specific Gravity:
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3.02 - 3.26
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Refractive Index (R.I.):
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1.616 - 1.634 to 1.630 - 1.652
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Bi-refringence:
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0.014 to 0.021
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Optic Sign:
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Negative
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Optical Character:
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Uniaxial
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Crystal Structure:
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Trigonal
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The Ross Jewelry Company - 5 Piedmont Center, Suite 110 - Atlanta, Georgia 30305 - (404) 495-3720

Copyright © 1999-2012 | Tourmaline in Atlanta | The Ross Jewelry Company, Incorporated | Atlanta, Georgia | All Rights Reserved |
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