Because naturally blue topaz is very rare, light colored topaz is often irradiated and heat treated to produce the coveted blue color. Topaz rates an 8 on the Mohs Hardness Scale and is December's birthstone.
Red Topaz is one of the most rare color of all the colorful topaz gemstones; almost unavailable and extremely valued. The largest faceted red topaz in the world is an oval brilliant cut gem which weighs 70.40 carats.
Pink and red topaz are normally only available in small stones and a slightly higher degree of inclusions are tolerated. These inclusions are usually liquid inclusions
Occasionally trapped minerals such as rutile can be found in topaz.
Topaz was a favorite gemstone during this period, especially yellow colored topaz. Although citrine was sometimes substituted for topaz, whether by accident or design, it was the yellow colored gem set in yellow gold that was desirable.
The colored topaz stones are rarely vivid in hue. Hardness is 8, but it's not without danger of cleavage. It has a wide color range, the most valuable of which is pink., sometimes referred to as Imperial Topaz.. Birthstone for November.
Yellow/Orange topaz is occasionally irradiated to intensify color. Pink/Red topaz is usually heat treated chromium bearing pinkish-brown to orange stones. Brown topaz is not enhanced.
A few other favorites come to mind: an over-100-carat morganite, dark, fine pink from Madagascar; a sapphire-blue euclase from Zimbabwe; a 14-carat red topaz from Russia; and a suite of six large, fine demantoids.
Topaz sometimes has the amber gold of fine cognac or the blush of a peach and all the beautiful warm browns and oranges in between. Some rare and exceptional examples are pale pink to a sherry red. Sometimes peach-colored topaz can be "pinked" by ...
A place near Brazil's minas state gives golden topaz for many years now. Usually, topaz occurs colourless or in brown colour. But, few parts of the world offers different coloured topaz. These colours are naturally occurred.
treatment is claimed to be more durable than the vapor color-coating mentioned above. Many of these enhancement treatment s are done in Sri Lanka. Another relatively new process in the topaz enhancement industry is the "Center-Fussed Colored Topaz" ...
 See also: Gemstone, Stone, Color, Topaz, Jewel
  
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