Tanzanite blue purple

Tanzanite is a rare and valuable gemstone known for its intense blue-violet color, found exclusively in the Merelani Hills of Tanzania.

About this subject

Tanzanite is a variety of the mineral zoisite, discovered in 1967 by geologist Manuel de Souza in the Arusha region of Tanzania. Its characteristic color ranges from sapphire blue to deep violet, resulting from traces of vanadium in its crystal structure. The gemstone is often subjected to low-temperature heat treatment (around 500°C) to enhance or uniform its color, a process widely accepted in the market. The only known source of tanzanite is the Merelani Hills, an area of about 7 square kilometers, where mining is controlled by the Tanzanian government and licensed companies. This geographic exclusivity contributes to its rarity and value, especially as reserves are estimated to be depleted within a few decades. Tanzanite is one of the most popular gemstones of the 20th century, frequently used in fine jewelry such as rings, necklaces, and earrings. Its hardness of 6.5 to 7 on the Mohs scale makes it suitable for daily wear, though it requires care to avoid scratches. Interestingly, the gemstone was promoted by Tiffany & Co. in 1968, which named it 'tanzanite' in honor of its country of origin, and its allure has only grown since. In architecture and design, tanzanite's blue-violet hue inspires sophisticated color palettes, used in cladding, tinted glass, and decorative elements that evoke luxury and elegance.

Frequently Asked Questions

Where is tanzanite found?

Tanzanite is found exclusively in the Merelani Hills of Tanzania, the only known source of this gemstone in the world.

Is tanzanite heat-treated?

Yes, most tanzanite undergoes low-temperature heat treatment to enhance its blue-violet color, a process accepted in the jewelry industry.

What is the hardness of tanzanite?

Tanzanite has a hardness of 6.5 to 7 on the Mohs scale, making it relatively durable but prone to scratches if not handled carefully.