Gemstone guide
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What is Tanzanite?
Tanzanite is a variety of zoisite, coloured by vanadium. A guide to the gem, and to buying one well.
About Tanzanite
01- Species
- Zoisite
- Variety
- Tanzanite
- Hardness (Mohs)
- 6 - 7
- Refractive index
- 1.69 - 1.70
- Colour caused by
- Vanadium
Tanzanite is a gemstone of exquisite allure, celebrated for its captivating blue hues that range from the deepest royal blue to a vivid azure. Originating exclusively from the foothills of Mount Kilimanjaro in Tanzania, this remarkable stone is a treasure of Africa, embodying the essence of its unique provenance. The value of tanzanite is driven by its intense colour, clarity, and expert craftsmanship.
Many tanzanites undergo a gentle heating process to enhance their vibrant blues, a common and accepted practice that reveals the stone's true potential. At STARLANKA, we offer an array of cuts, including the elegant emerald and the refined brilliant diamond cut, ensuring each piece is a testament to fine jewellery artistry. With prices starting from around $150 per carat, tanzanite offers both splendour and sophistication.
Judging quality
02What drives the value
- Color intensity
- Clarity
- Size
What to watch for when buying
- Misleading claims of unheated stones when they are actually heated
- Overpaying for lower quality stones marketed as high grade
Origin, treatment and trade names
03Where it comes from
TreatmentAs disclosed for the stones we sell; every listing states its own.
Trade names
Price per carat
04- Typical price
- $295 per carat
- Most stones
- $200–$428 per carat
- Based on
- 163 stones in our stock, updated weekly. Tanzanite prices by carat size →
From our stock
05
From the journal
06
Frequently Asked Questions
07Where does tanzanite come from?
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Tanzanite is sourced exclusively from Tanzania, Africa, specifically near Mount Kilimanjaro.
Is tanzanite treated?
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Many tanzanites are gently heated to enhance their colour, a standard practice in the gemstone industry.
What determines the value of tanzanite?
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The value of tanzanite is primarily determined by its colour intensity, clarity, and the quality of its cut.
How do I choose a tanzanite stone?
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When selecting tanzanite, consider the depth of colour, clarity, and the precision of its cut to ensure a piece that resonates with your personal style.
Is tanzanite certified?
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Many tanzanites are accompanied by a laboratory certificate from renowned labs such as GIA and LOTUS. Certification is available on request for any stone.
Shop
Tanzanite
Every stone shows its own price, weight, origin and treatment. Browse our tanzanite, or contact our team for personal help choosing one.