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Tanzanite

- also known as Zoisite

from the AGTA website:

http://www.agta.org/gemstones/variation-tanzanite.html

 

"Tanzanite is an exotic, vivid blue, kissed by purple hues. Legend has it that tanzanite was first discovered when some brown gemstone crystals lying on the dry earth were caught in a fire set by lightning that swept through the grass-covered hills. The Masai herders driving cattle in the area noticed the beautiful blue color and picked the crystals up, becoming the first tanzanite collectors.

Tanzanite has the beauty, rarity and durability to rival any gemstone. It is the ultimate prize of a gemstone safari. Tanzanite is mined only in Tanzania at the feet of the majestic Mount Kilimanjaro.

One of the most popular blue gemstones available today, tanzanite occurs in a variety of shapes and sizes and also provides a striking assortment of tonal qualities. Rarely pure blue, tanzanite almost always display its signature overtones of purple. In smaller sizes, tanzanite tends toward the lighter tones and the lavender color is more common. While in larger sizes, tanzanite typically displays deeper, richer color.
 

Tanzanite is so hot, it was the first gemstone added to the birthstone list since 1912 by the American Gem Trade Association.

Virtually every tanzanite is heated to permanently change its color from orange-brown to the spectacular violet-blue color for which this precious gemstone variety is known."

 

Here is a link to GIA's Buyer's Guide to Tanzanite:​

http://www.gia.edu/tanzanite#buyers-guide

primary source in merelani, tanzania
 
colors available:   violet-blue
blue
purple
purple-blue
family/species:   zoisite
properties:   RI=1.691-1.704 DR
SG=3.30 (+/-0.10)
hardness=6-7

suitable for use in jewelry but not recommended for rings that will be used frequently or that have unprotected settings
treatments:  

almost always enhanced by heat

(see policy on Treatment Disclosure)

important information   smaller stones of intense color are rarer than larger stones of the same color
note: ultrasonic cleaners can harm stones
birthstone:  

december

anniversary:  

24th

cuts:   free sizes and calibrated in standard cuts
rough:   rough available by order only - please Contact Us for details
mining:   found primarily in Merelani, northern Tanzania and as a secondary product of tsavorite mining in southern Kenya

Photo Gallery: Selected Tanzanites

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