Yellow topaz is sometimes called "precious topaz" to distinguish it from the names "gold" and "madeiria topaz", which are in fact citrine (quartz). Yellow topaz is sometimes heat treated to make it look pink.
[Precious topaz gems, the color at the tip of the large stone is Imperial color] ...
Precious topaz is most often found in a scissors cut, a rectangular gem cut with curved sides that has triangular facets. Ovals, cushions, and emerald cuts are also available.
In contrast, precious topaz (a.k.a. ‘imperial’ topaz) in rich orange colors fetches prices in excess of $1000/ct. for large (10 ct. +) sizes. The most valuable topaz is a rich pink or red color, and can reach $3500/ct. at retail.
The little town of Ouro Preto in the state of Minas Gerais, Brazil, is the only locality in which commercially significant deposits of precious topaz are found. No other locality, no other country produces this Imperial version of Topaz.
True, or precious topaz, as it is usually called, to distinguish it from the softer and less valuable yellow quartz, is seldom seen in the trade to-day. Jewelers almost always mean yellow quartz when they speak of "topaz.
The traditional birthstone for November is Yellow Topaz, which is commonly called Precious Topaz or Imperial Topaz. Precious Topaz is found in a variety of colors, including pink, blue, clear and green.
Nowadays topaz is sometimes also called "precious topaz" and designates a group of gemstones whose members occur in many different colors.
No other country produces topaz in which commercially significant deposits of precious topaz are found. Especially rare are the orange-pink to reddish stones found in Ouro Preto. Any topaz with a reddish tone is considered rare.
Due to its close resemblance in color to citrine, the yellow to orange topazes were termed "precious topaz" to distinguish between the two. Topaz comes in many hues, from colorless through yellow, blue, brown, red and everything in between.
Natural color topaz is known as precious topaz and imperial topaz, whereas the Imperial Topaz was the topaz with pink tones which were discovered in the 19th century Russia.
Imperial topaz, which is also known as "precious topaz," was named in honor of the Brazilian monarchy who prized its unusual and rich golden-sherry hue.
Topaz: A gem species that occurs in a wide range of colours. The most well-known are the precious topaz varieties in sherry-like hues. Pink topaz is the rarest.
The only known exceptions (those that are truly topaz) are imperial topaz, oriental topaz and precious topaz.
Some of these beads are cut in India, so irregularities in shape, size and other qualities should be expected. Citrine is easily scratched.
Some orange diamonds are a brownish orange, we try to ensure that any orange stones we select are closer to a pure orange than brown. Orange diamonds look very startling. They are often similar in colour to amber or precious topaz, ...
The names quartz topaz, smoky topaz, scotch topaz and Madeira topaz are all misnomers, and generally do not refer to real topaz. 'Precious Topaz' is the term reserved for a true gem topaz that has the color of a peachy-champagne tone and an intense ...
The most popular topaz is the tawny yellow variety, most of which comes from Brazil. Since at one time, all such yellow gemstones were known as topaz, the most valuable type is frequently called "precious topaz", which has a pinkish overtone.
 See also: Precious, Stone, Topaz, Color, Jewel
  
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