What is Topaz Gemstone | Topaz Stone – GIA
Precious topaz is a birthstone for November and blue topaz is a birthstone for December. Blue topaz is the gem of the 4th anniversary and Imperial topaz is the gem of the 23rd anniversary.
Historical Reading List: Imperial Topaz from Minas Gerais, Brazil
Topaz is an important gemstone found in both plutonic and volcanic igneous rocks, and on occasion in metamorphic rocks. Silica- and fluorine-rich, topaz-bearing igneous rocks include granites, pegmatites, greisens, and hydrothermal veins.
Topaz Description - GIA
Imperial topaz is a medium reddish orange to orange-red. This is one of the gem’s most expensive colors. Sherry topaz—named after the sherry wine—is a yellowish brown or brownish yellow to orange.
Topaz History and Lore - GIA
The name for imperial topaz originated in nineteenth-century Russia. At the time, the Ural Mountains were topaz’s leading source, and the pink gemstone mined there was named to honor the Russian czar.
Topaz Quality Factors - GIA
Many dealers insist that a stone must show a reddish pleochroic color to be called imperial topaz. The reddish pleochroic color often appears at the ends of fashioned gems—like pears and ovals—that have an otherwise yellow-to-orange bodycolor.
November Birthstones | Topaz & Citrine Birthstone Information - GIA
Blue topaz is the gem of the fourth wedding anniversary, and Imperial topaz is the gem of the 23rd wedding anniversary. One of the most sought-after November birthstones is this pinkish orange Imperial topaz.
How do I know if a topaz is “Imperial topaz”?
There is no official standard for Imperial topaz. Some dealers use the term for colors that are orange to pink to red to purple; others reserve the term for certain saturated shades. It’s the color, not the term “Imperial,” that gives topaz its value.
Cutting the ‘Imperial Flame’ Topaz | Research & News
2016年4月28日 · The Imperial Flame, a superb natural color Brazilian topaz, was fashioned from a 615 ct crystal recovered over 20 years ago. The finished piece measures 89.53 × 20.56 × 19.15 mm and weighs 332.24 ct. Photo courtesy Sonja Kreis Unique Jewelry.
What is Topaz Gemstone | Topaz Stone - GIA
Red is one of the most sought-after topaz colors and represents less than one-half of 1 percent of facet-grade material found. The color the trade calls imperial topaz is highly prized and very rare. Many dealers insist that a stone must show a reddish pleochroic color to be called imperial topaz.
Topaz - Gemological Institute of America
Imperial topaz is a reddish orange to orange-red, and is very expensive. Sherry topaz is yellowish brown to orange. It is often called “precious” to tell it apart from other, less expensive stones that are a similar color.