Global Gemology - Rare Gems & Jewels
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tanzanite


4.93 ct. fine blue tanzanite & diamond three-stone ring in platinum
Tanzanite & diamond three-stone ring
Variety:  Tanzanite
Species:  Zoisite
​​Mohs Hardness:  6 to 6.5 out of 10
Color:  Light to medium-dark bluish purple and violetish blue to violet.
RI:  1.691 to 1.700 (+/-0.005)
Birefringence:  0.008 to 0.013
SR/DR/AGG:  DR
Optic Character:  Biaxial positive
Pleochroism:  Strong.  Usually strong blue, purplish red and greenish yellow.  Sometimes, strong blue, violet and colorless.
Spectrum:  Not diagnostic, but you might see bands at 595, 528 and 455nm.
Fluorescence:  Generally inert
SG:  3.35 (+0.10 / -0.25)
Routine Treatments:  Heating

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tanzanite facts

Photo of an oval tanzanite
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals


Tanzanite is a beautiful gem found in only 1 location on earth:  the Merelani hills of northern Tanzania.

Its color ranges from blue to violet, to purple.

Tanzanite was first discovered in 1967, and was originally thought to be a sapphire deposit.

​
Tiffany & Co. became interested in this new gem and made a deal to become its main distributor in 1968.

Fun Fact:  Tiffany & Co. is actually responsible for naming tanzanite after the country it was discovered in!

The Queen of Kilimanjaro is a famous white gold tiara featuring a 242-carat tanzanite accented by tsavorites and diamonds.

   
Tanzanite is a December birthstone and is the 24th wedding anniversary gemstone.


EGL Certified tanzanite tennis bracelet set with 33.29 carats.
Tanzanite tennis bracelet

tanzanite gallery

youtube video

  • HOME
  • ABOUT US
  • SHOP
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • DECORATIVE PRINTS
    • THE ART OF GEMOLOGY
  • APPRAISALS
    • INSURANCE
    • DIVORCE
    • ESTATE TAX
    • ESTATE DISTRIBUTION
    • CHARITABLE DONATION
    • LIQUIDATION
    • APPRAISALS THRU EMAIL
  • SELL YOUR JEWELRY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY
  • BLOG