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Tanzanite Gemstone Information
Information * Loose gemstones * Jewelry links

Tanzanite is the gemstone representing the 24th wedding anniversary. It has been recognized as helping one deal with change. Tanzanite is also known to uplift the spirit and open the heart. The blue and purple hues of tanzanite are associated with generosity and friendship.

Click to view AGTA code.

Refractive Index 1.691-1.700
Hardness = 6-7 (Moh's Scale)
Specific Gravity =3.35
Species - Zoisite
Optic Character - Double Refraction.
Phenomena - Chatoyancy (rare)


Ultrasonic: Never use.
Steamer: Never use.
Heat: Very poor; sudden temperature changes may cause cracking.
Chemicals that harm:  Hydrochloric/hydrofluoric acid.


Crystal Structure
Tanzanite crystal image.
Crystal system: Orthorhombic; multi-faced prisms, striated.


 January  Garnet
February Amethyst
March Aquamarine
April Diamond
May Emerald
June Pearl/Alexandrite
July Ruby
August Peridot
September Sapphire
October Opal/Tourmaline
November Topaz or Citrine
December Blue Topaz or Zircon
Common Cut Examples.
Round brilliant cut tanzanite.
Round cut.
Oval shape tanzanite.
Oval shape.
Pear shape tanzanite.
Pear shape.
Marquise cut tanzanite.
Marquise cut.
Trillion cut tanzanite.
Trillion cut.
Emerald cut tanzanite.
Emerald cut.
Straight baguette tanzanite.
Straight Baguette.
Princess cut tanzanite.
Princess cut.
Step cut.
Modified square cut tanzanite.
Modified square.
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