Gemstones, Diamonds, Pearls - Multicolour.com
My Shopping Cart My Account Gem Library
|Welcome to Multicolour.com|Single Stones|Calibrated Stones|Pairs|Mix Lots|Closeouts|Carved Gems|lapidary and gemological tools and supplies|Gem Smart Search|
 Call Now 1-866-900-GEMS in USA April 19, 2025  

Natural Tanzanite

Affordable and beautiful, the rich violet-blue colors of tanzanite have made it one of the most popular colored stones in recent years. Found only in Tanzania near the town of Arusha, tanzanite is a rare gemstone irregularly available in enough quantity to meet the strong demand.


Find your Tanzanite

Our Tanzanite(s) are available in various shapes, sizes and colors. 495 Tanzanite(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Shape Length (mm) Width (mm)
Category Weight (cts) Price (USD)
Color range
red-orange or orange-red
blue
greenish yellow
violetish blue
yellow-green or green-yellow
bluish violet
green
violet
very slightly bluish green
bluish purple
bluish green
purple
green-blue or blue-green
reddish purple
greenish blue
red-purple or purple-red

Tanzanite Profile

Color information: Blue, Blue Purple, Green, Pink.
Refractive Index: 1.688 - 1.707
Chemical Composition: Ca2(Al,OH)Al2(SIO4)
Hardness: 6-7
Density: 3.30 (+.10, -.10)
Crystal Group: Orthorhombic
Ocurrence: Tanzania
Sign of the Zodiac: N/A
Month of the year: N/A
Tanzanite Tanzanite
A variety of Zoisite, tanzanite is the trade name for the transparent blue – violet blue variety. Tanzanite is generally enhanced by heat unless otherwise specified. The unheated crystals can be green, violet, yellowish or, light blue but a brownish root beer color is most common. Heating at 380 degrees C will produce the intense top blue sapphire color. Surprisingly, it is the dark brown crystals that produce the most valuable dark blue stones after heating. The treatment is permanent and accepted in the trade.

Tanzanite is trichroic and exhibits pronounced pleochroism. The colors respective to the three vibrational directions are sapphire-blue, sage green, and purple. Orientation is an important consideration for cutters who need to consider both the yield and the resulting color.

Because of their similarity in color, comparisons between tanzanite and sapphire are inevitable. Fine tanzanites are more affordable and usually better in terms of both color and clarity. However, tanzanites are soft compared to sapphire. Top color sapphires are more rare, much harder, extremely tough and, much more expensive.

Historical tanzanite prices have shown amazing volatility and fluctuations. Wholesale prices for top stones have ranged between $150 to $1000/ct. over the last 20 years. A function of supply and demand, tanzanite prices have always recovered because of their fine color, clarity and affordability.

Grading Tanzanite

We grade and price our tanzanites according to color, size, cut and clarity. Color is the most important factor in determining the value. Most dealers would assess the color component of a stone at between 50 – 70% of its value. In general the best color is bright, rich, and intense. Vivid violetish blue or bluish violet colors are best. Tanzanite can be too dark or too light and the best tones are medium to medium dark. Some dealers describe describe the best colors as AAA.

There is a GIA color guide that rates the colors. This is not a final rule about color grading but it is something the buyer can consider. We color grade our stones according to the closest possible match from the GIA color set.

The guide rates the tanzanite colors as follows on a scale from 1-10: vB 6/5 - 10, bV 6/5 - 8.1, B6/5 - 8.1, vB 5/5 - 6.4, V 6/4, vB 7/5 - 6.4, vB 5/5 6.4 .. and the list goes on but selecting the color you like is more important.

Photographing Tanzanite

Our tanzanites are photographed with cool daylight. We don’t use incandescent lights as they would accentuate the violet components in tanzanite. We do not edit the hue but we may adjust brightness and contrast. Our monitors are set at 50% brightness for working with images. Computer images will show some variation due mostly to monitor settings. For additional clarification, we also verbally approximate tanzanite color. What you see on your screen is probably very close to the actual color but our verbal description may also be useful.

Looking for other Gemstones?

Search Gems by Color | Advance Search | Step-by-Step Search Wizard


Search/
Search for:
Search Site Gems
Enter keywords or item #. (i.e ruby or YDFG97a).
Shopping Cart: Empty

Finest gems/
Demantoid Single
From our finest gemstones collection
Demantoid Single Oval Slightly to Moderately included
Size: 7.50 X 6.30 MM
Weight: 2.060 CTS
Shape: Oval
Clarity: Slightly to Moderately included
Usually ships within 24 hours
OUR PRICE
USD 1442.00
VIEW DETAILS  ADD TO SHOPPING CART


Deal of the Day/
Danburite Single
limited time offer, ref# XDN237ez
Danburite Single Octagon Eye clean
Size: 8.50 X 5.80 MM
Weight: 1.650 CTS
Shape: Octagon
Clarity: Eye clean
Usually ships within 24 hours
10 % OFF, YOU SAVE 1.98 USD
NOW ONLY
USD 17.82
VIEW DETAILS  ADD TO SHOPPING CART

Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1698 Sapphire ’s available
Browse gems | Learn More
Spinel Spinel
454 Spinel ’s available
Browse gems | Learn More
Alexandrite Alexandrite
294 Alexandrite ’s available
Browse gems | Learn More
Tanzanite Tanzanite
450 Tanzanite ’s available
Browse gems | Learn More
Zircon Zircon
227 Zircon ’s available
Browse gems | Learn More
Gemstone Variety: Hits Index
Going Up Amber +35569 +0.6%
average price USD 183.13 per item
Going Down Sapphire -19788 -0.6%
average price USD 401.21 per item
Going Down Parisite -3308 -0.4%
average price USD 122.67 per item
Going Down Anatase -3183 -0.4%
average price USD 221.50 per item
Going Down Alexandrite -3694 -0.4%
average price USD 1956.52 per item
See more real time gem reports.
Exchange rates to USD
Canada Dollars 1.388
Euro 0.880
United Kingdom Pounds 0.756
Japan Yen 142.588
Switch our prices in your home currency.

Gem Library /
Gems Legend and  Lore This month birthstone: Diamond
More from the Gem Library about Birthstones.
Aries Aries
March 21 – April 19
Cardinal sign. Born to be a Leader. Your zodiac stone...more

Subscribe Newsletter/
Name:
E-mail:
Review our Privacy Policy.


 Top of Page Help/FAQ  

Gemstones for sale: Alexandrite, Garnet, Diamond, Opal, Spinel, Sapphire, Tourmaline, Tanzanite, Tsavorite,
Gemstones by Category: Calibrated, Carving, Closeout, Jewelry, Mixed Lot, Pair, Rough, Single, Best Sellers or Featured Gemstones.
Gemstone education: Colored Gemstones Guide, Gems Library, Gemstone Treatments, Gemstone Glossary, Gems and Astrology,

All Transactions secure by Thawte certificate - click here to validate Ebay Power Seller Gem Certification Various Shipping Options Major Credit Cards Accepted

© Copyright David Wein Ltd, 1998-2024. All trademarks and logos shown herein are the property of their respective owners. This website is legally owned and operated by David Wein Ltd, Hong Kong. DPMS Registration No. A-B-24-11-08424. The website operations and customer services are managed by Multicolour Gems Co Ltd in partnership with David Wein Ltd. Use of this site constitutes acceptance of Return Policy, Privacy Policy and Trading Guarantee.

Site design and maintenance by NetComposite ®.