TANZANITE, the gemstone variety of zoisite

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VARIETY INFORMATION:

  • VARIETY OF: Zoisite, Ca2Al3(SiO4)3(OH), Calcium Aluminum Silicate Hydroxide.
  • USES: Gemstone
  • COLOR: various shades of blue to lavender, deeper along the crystal axis.
  • INDEX OF REFRACTION: 1.68 - 1.72
  • BIREFRINGENCE: is good
  • HARDNESS: 6.5-7
  • CLEAVAGE: perfect in one direction
  • CRYSTAL SYSTEM: orthorhombic
  • For natural tanzanite mineral specimens see our For Sale or Sold lists
    For Tanzanite Jewelry, see --> TANZANITE JEWELRY

Tanzanite is relatively new on the gemstone market, but has left its mark. Its blue-lavender color is rather unique and a wonderful addition to the gemstone palette. Found in Tanzania (hence the name) in 1967, it has since become a well known and widely distributed gemstone. It has become so popular that in October of 2002 the American Gem Trade Association (AGTA) announced that tanzanite had joined zircon and turquoise in the traditional list of birthstones for the month of December.

It has better fire than the tourmaline elbaite or peridot and an adequate hardness. Its only one direction of cleavage is somewhat of a problem because it is oriented with the direction of strongest pleochroism. This would be a problem in most gemstones because that is the direction the gemcutter would usually select to maximize the color. However, with tanzanite the color is usually strong enough anyway.

Pleochroism is very pronounced in tanzanite and is seen as three different color shades in the same stone. In the viewing of a tanzanite stone from different angles, the colors dark-blue, green-yellow and red-purple can all be seen as a result of the pleochroism. Lesser stones may have a brownish color due to the mixing of blue, purple and green. These stones are usually heat treated to a deep blue color. Iolite is a blue-violet gemstone variety of the mineral cordierite, has strong pleochroism and can be confused with tanzanite. However, iolite is usually less strongly colored, its pleochroic colors vary from blue-violet to yellowish gray to blue and it has less fire.

Nearly all tanzanite has been heat treated to generate the beautiful violet-blue color this stone is known for.  When first mined, most stones are a muted green color. The only known source of Tanzanite is a five square mile hilltop at Merelani, ten miles south of the Kilimanjaro International Airport in Tanzania.

Tanzanite Jewelry - Hover over an item for more information
.84 carat Oval-Cut Tanzanite Ring in 14k Gold Over Sterling Silver, Size 8, Size 8
Rated by 25,000+ Customers. .84 TCW Oval-Cut Tanzanite Ring in 14k Gold Over Sterling SilverOnly $75.99 at PalmBeachJewelry
no photo.84 carat Oval-Cut Tanzanite Ring in 14k Gold Over Sterling Silver, Size 8, Size 8
$75.99
PalmBeachJewelry
Sterling Silver Tanzanite Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $181.49 at JeGem.com
no photoSterling Silver Tanzanite Ring Jewelry
$181.49
JeGem.com
Round Genuine Tanzanite Diamond Accent Platinum over Sterling Silver Ring, Size 10,6,7,8,9, Size 10,6,7,8,9
Rated by 25,000+ Customers. Round Genuine Tanzanite Diamond Accent Platinum over Sterling Silver RingOnly $94.99 at PalmBeachJewelry
no photoRound Genuine Tanzanite Diamond Accent Platinum over Sterling Silver Ring, Size 10,6,7,8,9, Size 10,6,7,8,9
$94.99
PalmBeachJewelry
1.48 carat Marquise-Cut Tanzanite Ring in Platinum over Sterling Silver, Size 6,7,8, Size 6,7,8
Rated by 25,000+ Customers. 1.48 TCW Marquise-Cut Tanzanite Ring in Platinum over Sterling SilverOnly $113.99 at PalmBeachJewelry
no photo1.48 carat Marquise-Cut Tanzanite Ring in Platinum over Sterling Silver, Size 6,7,8, Size 6,7,8
$113.99
PalmBeachJewelry
Tanzanite Eternity Ring
Tanzanite is the ideal stone for an eternity ring, the classic symbol of devotion. We have paired nearly 1/4 carat of this spectacular gemstone with genuine diamonds to create a ring of breathtaking beautyand elegance. Ablaze with color and light, this...Only $297.00 at Danbury Mint
no photoTanzanite Eternity Ring
$297.00
Danbury Mint
Ross-Simons 2.40ct t.w. Graduated Tanzanite, .10ct t.w. Diamond Bar Necklace
An RS exclusive. A vibrant line of 2.40 ct. t.w. graduated tanzanites and .10 ct. t.w. diamonds brings sensational shimmer to this curved bar necklace. Suspends from a rolo chain with springring clasp. Sterling silver necklace.Only $250.00 at Ross-Simons
no photoRoss-Simons 2.40ct t.w. Graduated Tanzanite, .10ct t.w. Diamond Bar Necklace
$250.00
Ross-Simons
Ross-Simons .70 ct. t.w. Tanzanite Hoop Earrings in Sterling Silver
Vibrant, violet-colored rounds give these small hoop earrings a hint of vivacity. Includes .70 ct. t.w. of tanzanites. Hinged post, sterling silver earrings.Only $97.50 at Ross-Simons
no photoRoss-Simons .70 ct. t.w. Tanzanite Hoop Earrings in Sterling Silver
$97.50
Ross-Simons
.76 carat Marquise-Cut Purple Genuine Tanzanite Diamond Accent 10k White Gold Classic Ring, Size 6,7,8,9, Size 6,7,8,9
Rated by 25,000+ Customers. .76 TCW Marquise-Cut Purple Genuine Tanzanite Diamond Accent 10k White Gold Classic RingOnly $218.49 at PalmBeachJewelry
no photo.76 carat Marquise-Cut Purple Genuine Tanzanite Diamond Accent 10k White Gold Classic Ring, Size 6,7,8,9, Size 6,7,8,9
$218.49
PalmBeachJewelry
Ross-Simons Tanzanite Bead Multi-Strand Necklace With 14kt Yellow Gold
The beautiful shade of purple of this tanzanite multi-strand necklace brings to mind lush fields of English lavender. Necklace is finished with a 14kt yellow gold toggle clasp.Only $695.00 at Ross-Simons
no photoRoss-Simons Tanzanite Bead Multi-Strand Necklace With 14kt Yellow Gold
$695.00
Ross-Simons
Tanzanite Eternity Stackable Ring Band 14K White Gold (0.75ct)
Twenty-seven natural and genuine tanzanites are circling all the way around this unique and modern gemstone eternity band for women. The stones have been beautifully set in an elegant 4-prong 14kt white gold setting. Wear it as a standalone right-hand...Only $490.00 at Allurez.com
no photoTanzanite Eternity Stackable Ring Band 14K White Gold (0.75ct)
$490.00
Allurez.com
Ross-Simons Set of Three .80ct t.w. Diamond, Tanzanite Eternity Bands. Size 9
An RS exclusive. This set of three diamond and tanzanite eternity bands features .70 ct. t.w. of tanzanites and .10 ct. t.w. diamonds set upon antique-style, openwork bands. So romantic! Sterling silver rings. Diamond birthstones are the perfect gift...Only $187.50 at Ross-Simons
no photoRoss-Simons Set of Three .80ct t.w. Diamond, Tanzanite Eternity Bands. Size 9
$187.50
Ross-Simons
Ross-Simons 3.30ct t.w. Tanzanite, .10ct t.w. Diamond Bangle Bracelet in Silver
Reminiscent of the Art Deco period, we bring you this dramatic bangle bracelet with charismatic style. 3.30 ct. t.w. tanzanites are intertwined with .10 ct. t.w. diamonds. Box clasp and hinge, sterling silver bracelet.Only $325.00 at Ross-Simons
no photoRoss-Simons 3.30ct t.w. Tanzanite, .10ct t.w. Diamond Bangle Bracelet in Silver
$325.00
Ross-Simons
3.01 carat Emerald-Cut Amethyst and Tanzanite Accented Ring in Platinum over Sterling Silver, Size 6,7,8,9, Size 6,7,8,9
Rated by 25,000+ Customers. 3.01 TCW Emerald-Cut Amethyst and Tanzanite Accented Ring in Platinum over Sterling SilverOnly $75.99 at PalmBeachJewelry
no photo3.01 carat Emerald-Cut Amethyst and Tanzanite Accented Ring in Platinum over Sterling Silver, Size 6,7,8,9, Size 6,7,8,9
$75.99
PalmBeachJewelry
Ross-Simons 3.40ct Tanzanite, .70ct t.w. White Topaz Ring in Gold Over Sterling
This ring has a vintage-inspired quatrefoil design that provides a rich presence. Its center 3.40 ct. tanzanite cabochon is sparked by .70 ct. t.w. white topaz with a black rhodium finish. 14kt yellow gold over sterling silver ring.Only $295.00 at Ross-Simons
no photoRoss-Simons 3.40ct Tanzanite, .70ct t.w. White Topaz Ring in Gold Over Sterling
$295.00
Ross-Simons
Topaz & Tanzanite Majesty Ring
Gemstones at their very best!Sixteen enchanting tanzanite gemstones and four shimmering diamonds surround a magnificent Swiss blue topaz in this elegant sterling silver ring.Available in whole sizes 5 to 10.Only $199.00 at Danbury Mint
no photoTopaz & Tanzanite Majesty Ring
$199.00
Danbury Mint

This Site Awarded
Available TANZANITE specimens:
see this List of ALL specimens including SOLD ones
 

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