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Q.

What is color of TOPAZ?

Asked by venkat mani, 05 Aug '07 12:10 pm
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Answers (3)

 
1.

MOST NATURAL TOPAZ IS COLOURLESS.
Topaz varietal names based on color are limited to one, Imperial Topaz, which connotes a vivid reddish-orange, but is also sometimes used (incorrectly) to denote a sherry-colored, orangish-brown. Other colors are blue, pink, red (very rare), lavender (also very rare), greenish-yellow, yellow, brown and colorless. Colorless and blue varieties contain higher concentrations of fluorine than do yellow or pink stones, resulting in variations in the optical and physical properties. Except in some red or pink stones, where trace quantities of Cr act as a chromophore, the color in topaz is due to color centers. This makes them good candidates for color-change through irradiation and heating. Most natural topaz is colorless or very pale blue; the dark blue color so commonly seen today is produced by irradiation, usually followed by heating.
Answered by GOPI KUMAR, 05 Aug '07 12:18 pm

 
  
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2.

Yellow,blue,green,colourless or white
Answered by mahalakshmi, 05 Aug '07 12:22 pm

 
  
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3.

Colour of topaz is a crucial characteristic to be kept in mind while making the purchase. Topaz is available in variety of colours. Sometimes these colours are naturally occurred else it is coloured by the colour centers. In this techno savvy world, through technology of irradiation and heat treatment colour centers creates different colours for topaz. For example, colourless topaz is often treated to become blue. Chrome obtained from Brazil is heated and turned into pink colour. Topaz contains chromium that is a impurity, which when heated at about 4500 F produces different shades of red, orange and sometimes violet.

Today's gem market has given us many color choices for this beautiful gemstone. The stunning golden Imperial topaz and the delicate to deep pink and red topazes are the most highly prized. Colorless topaz, also known as silver topaz, is the most plentiful variety in nature, but man has had his hand in the palette, using colorless topaz as the canvas. Modern technology ...more
Answered by Raj Kumar, 05 Aug '07 12:25 pm

 
  
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