Tanzanite

Up

Tanzanite: "The Blue Treasure of Africa"

Origins of Tanzanite:

Tanzanite, discovered in East Africa in the 1960s transformed the jewelry world: new varieties, new colors, and new variations on existing gemstone species made that decade the most exciting time in the gemstone industry in our lifetimes. But no gemstone discovered in East Africa has had more of an impact on the world gemstone market than tanzanite, a velvety blue variety of the mineral zoisite that was found for the first time in 1967 and named after the country of its birth by Tiffany & Co. in New York, who introduced the gemstone to the world market in 1969. Tanzanite is the ultimate prize of a gem safari. Its rich purples and blues often have a depth comparable to the finest sapphire. Paler tanzanite has a delicate periwinkle color like the eyes of Elizabeth Taylor. It is supremely rare, coming from only one place in the world, the Merelani Hills of Tanzania, in the shadow of Mount Kilimanjaro.  The source of its mesmerizing color is that tanzanite is trichroic: that is, it shows different colors when viewed in different directions. One direction is blue, another purple, and another bronze, adding subtle depths to the color. When tanzanite is found in the ground, the bronze color dominates. However, with gentle heating, the cutter can watch the blue color bloom and deepen in the stone. Legend has it that the affect of heat was first discovered when some brown zoisite crystals laying on the ground with other rocks were caught in a fire set by lightning that swept through the grass covered Merelani hills northeast of Arusha. The Masai herders who drive cattle in the area noticed the beautiful blue color and picked the crystals up, becoming the first tanzanite collectors.

Mythology & Lore:

African Lore claims that Tanzanite calms "high frequency" types who tend to live in a very intense state, helping to slow them down and mellow them out. It keeps you organized, productive, and able to get a lot accomplished without being insensitive to others or being too bossy or demanding. It is balancing to those in a position of service and keeps them from over-extending themselves, or falling into negative habit patterns, such as being overly bossy. Tanzanite also has many of the same abilities as that of the blue Sapphire, in that it dispels stress, improves communications and is a mood elevator. It can also overcome long-term misfortunes and has been known to help protect from travel dangers.

Choosing a Tanzanite:

The color of tanzanite is most intense in sizes above four carats. Smaller tanzanites are usually paler in color. Tanzanites that are more blue rather than purple tend to be more expensive, more valuable and rarer because the crystals tend to form with the blue color axis oriented along the width of the crystal instead of the length. That means that if the cutter chooses to maximize the purity of the blue color, the stone cut from the rough will be smaller and will cost more per carat. The blue color, however, is so beautiful, that the sacrifice is often worth it. Tanzanite jewelry is a little more delicate than other gemstone jewelry and should not be worn during strenuous activity.

Specifications:

  • Mohs Hardness: 6.5
  • Chemical Composition: Ca2Al3Si3O12(OH)
  • Refractive Index: o=1.685-1.705, r=1.688-1.710, q=1.697-1.725
  • Density (Specific Gravity): 3.15-3.38

Cleaning & Maintenance:

Tanzanites should not be put in ultrasonic cleaners. For best care a mild solution of warm water with a very mild cleaner.

Return to Top of Page        Return to Index Page 

Copyright © 1998 - 2010 Penoir, Inc.
P.O. Box 823, Howell, MI 48844 USA
Telephone: 231-282-4294
Electronic mail: TJ@Penoir.com

Send mail to TJ@Penoir.com  with
questions or comments about this web site.
Last modified: November 20, 2009