Gemstones
Tanzanite
A violet-blue variety of zoisite, known commercially from a single area in northern Tanzania.
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Overview
Tanzanite is a blue-to-violet gemstone found commercially in the Merelani area near Arusha, Tanzania. Its geographic rarity is a large part of its appeal to the gem trade.
Unlike metals, tanzanite is valued stone by stone on colour, clarity, cut and size. Most tanzanite is heat-treated to develop its blue colour, which buyers should expect and have documented.
Product forms and buyer considerations
- Rough
- Uncut crystals for cutters and manufacturers.
- Cut and polished
- Finished stones for jewellery and collectors.
- Buyer considerations
- Tanzania regulates the trade in rough tanzanite; export rules affect which forms are practical.
Specifications to confirm
- Rough or cut, and carat weight
- Colour, clarity and cut description
- Treatment disclosure
- Gemmological laboratory report, if required
- Tanzanian export documentation
Due diligence
- Request an independent gemmological report for significant stones.
- Confirm compliance with Tanzanian export rules for the specific form.
- Check for imitations and look-alike stones.
The exact product form, specifications, documentation and availability must be confirmed for each proposed transaction. We do not publish prices, inventory, grades or delivery times.
Frequently asked questions
Is tanzanite treated?
Most tanzanite on the market is heat-treated. Treatment should be disclosed for each stone or parcel.
Can rough tanzanite be exported?
Export of rough tanzanite is regulated by Tanzania. Requirements are reviewed for each proposed transaction.
Do you supply certificates?
We do not claim certifications. Laboratory reports can be discussed as part of the transaction.
Submit an Inquiry — Tanzanite
Tell us your requirements and our team will follow up to discuss them.