1.78-Carat Fancy Unheated Tanzanite

1.78-Carat Fancy Unheated Tanzanite



A gorgeous purple-lavender-pink fancy unheated tanzanite cut in our custom “Hyperbola” brilliant oval design, 1.78 carats.

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SKU: ET1939 Categories: , Tags: , , , , ,


This gem was faceted from an unheated piece of tanzanite–most tanzanite has been heated to remove the orange-brown and greenish-yellow components and to turn the gem to a dark blue to purple-blue color. We prefer the natural mixed colors and pastel tones of unheated Tanzanite (sometimes called “Fancy Tanzanite” or “Fancy Zoisite”).  Tanzanite is the trade name for deep blue to blue-purple Zoisite that is found in only one location on the earth–the hills of Merelani, Tanzania.  This particular Tanzanite was cut to show a purple-lavender color. It also changes color under incandescent light to a more uniform light pink color. This Tanzanite has excellent clarity, making it bright and scintillating in the hand. There may be tiny inclusions that are visible only with a 10x loupe.

This Tanzanite is faceted in our custom “Hyperbola” brilliant oval design. The gemstone weighs 1.78 carats and measures 7.9 x 6.8 x 5.0 mm.

Additional information

Weight 8 oz
Dimensions 6 × 4 × 4 in

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Product Enquiry

Do your gems come with certificates?

We're often asked about this, and yes, we do include our own certificate of origin and authenticity.  You can learn more here: https://www.earthstreasury.com/what-about-a-certificate/

Can I have a custom piece of jewelry made?

We LOVE making custom jewelry for our clients!  You can learn more about how the process works here: https://www.earthstreasury.com/the-custom-jewelry-process/

What is your return policy?

We have a one-week review and return policy that starts the date you receive your gem.  We want you to be 100% sure you have the right gem.  Learn more here: https://www.earthstreasury.com/risk-free-review-and-return-policy/