Honey yellow. Fiery orange. Cyclamen pink. Icy blue. In warm or cool tones, topaz is a lustrous and brilliant gem.
Many consumers know topaz as simply an inexpensive blue gem. They’re surprised to learn that its blue color is hardly ever natural: It’s almost always caused by treatment. They might also be surprised to know that topaz has so many more colors to offer gem lovers, including pinks and purples that rival the finest fancy sapphires.
Topaz is allochromatic, which means that its color is caused by impurity elements or defects in its crystal structure rather than by an element of its basic chemical composition. The element chromium causes natural pink, red, and violet-to-purple colors in topaz. Imperfections at the atomic level in topaz crystal structure can cause yellow, brown, and blue color. Brown is a common topaz color, and the gem is sometimes mistakenly called “smoky quartz.”
Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color.
The color varieties are often identified simply by hue name—blue topaz, pink topaz, and so forth—but there are also a couple of special trade names. 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. Stones in this color range are often called precious topaz to help distinguish them from the similarly colored but less expensive citrine and smoky quartz.
Topaz is also pleochroic, meaning that the gem can show different colors in different crystal directions.
BIRTHSTONES & ANNIVERSARIES
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.
COLOR: Yellow, orange, brown, pink to red to purple red, blue , light green and colorless
REFRACTIVE INDEX: 1.619 to 1.627
BIREFRINGENCE: 0.008 to 0.010
SPECIFIC GRAVITY: 3.53
MOHS HARDNESS: 8
WHY WE LOVE THIS GEMSTONE
Topaz comes in some of the gem world’s largest crystals: the largest are kilos, not carats.
Faceted topaz takes such a high polish it’s slightly slippery to the touch.
Topaz is pleochroic, displaying different colors in different crystal directions.