Why tanzanite comes from only one place on earth
Updated
SHORT ANSWER
Natural tanzanite comes only from the Merelani Hills near Arusha in northern Tanzania, because the rare geological conditions that formed this blue-violet zoisite have not produced a commercial deposit anywhere else.
Key takeaways
- Tanzanite is a variety of the mineral zoisite.
- All commercial supply traces to Merelani, Tanzania.
- Tanzanian export documents are the core proof of lawful origin.
A geological accident
Tanzanite is a blue-violet zoisite formed by a rare combination of heat, pressure and vanadium in the Merelani Hills near Arusha. No commercial deposit has been found elsewhere.
What it means for buyers
Single-source supply makes export documentation from Tanzania the key proof of authenticity and lawful origin.
Questions buyers ask next
- Is tanzanite heat-treated?
- Most commercial tanzanite is heated to develop its blue-violet colour. Unheated crystals exist and should be disclosed as such per crystal.
- How is tanzanite origin documented?
- Through Tanzanian export permits and the transaction's custody records, released to the buyer after KYC.
- Can I see available tanzanite crystals?
- Yes. Souq Ore lists individual natural tanzanite crystals with prices, photos and specifications on its tanzanite page.