Skip to content

Tanzanite

📏 6.5 mm

⚖️ 1.36 ct

🌱 Natural tanzanite

Tanzania

Cut and finished in Tanzania

🔹

Sourced through our partner, Rubyfair

🤝 Responsibly sourced through Nineteen48's trusted supply chain

SKU TZ-TAN-000135
Original price £1,560.00 - Original price £1,560.00
Original price
£1,560.00
£1,560.00 - £1,560.00
Current price £1,560.00
Only one available

Tanzanite, a deep blue to violet colour gemstone found exclusively in Tanzania.

Nineteen48 has responsibly sourced tanzanites from a small-scale mine in northern Tanzania.

  • Tanzania

Tanzania has been a source of gemstones for decades. Most of the gem mining is either artisanal or small-scale (ASM). It is known for being the country where we find tanzanite, probably its most famous gemstone, which is much rarer than diamond. Other gemstones mined in Tanzania include sapphire, ruby, spinel and tsavorite garnet.

Miners often work in small teams using only hand tools, but there are also mines with some more advanced mechanisation. Gem mining has become an important part of the Tanzanian economy and mining overall is a significant employer, often providing income in communities where the opportunities to make a living are limited.

Gemstone mining in Tanzania is primarily overseen by the Ministry of Minerals and the Mining Commission, but there are also a number of other trade bodies and associations that represent the sector.

Gemmological Info

Composition: Ca₂Al₃[Si₂O₇][SiO₄]O(OH) (calcium aluminium silicate)
Crystal system: Orthorhombic
Hardness: 6–7
Cleavage: Perfect
Fracture: Uneven
Lustre: Vitreous
Specific Gravity (SG): 3.35
Refractive Index (RI): 1.691–1.700
Birefringence: 0.008–0.009
Optical nature: Biaxial (+)
Dispersion: 0.019