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Gemstone Tanzanite
Tanzanite is a rare blue-violet variety of the mineral zoisite, named after Tanzania – the only country in the world where this gemstone is mined. Discovered in the 20th century, it quickly gained popularity among jewelers and collectors.
Tanzanite is mined in the Merelani Hills in northern Tanzania, near the city of Arusha, beneath the majestic Mount Kilimanjaro.
Gemstone Tanzanite
Tanzanite is a rare blue-violet variety of the mineral zoisite, named after Tanzania – the only country in the world where this gemstone is mined. Discovered in the 20th century, it quickly gained popularity among jewelers and collectors.
Tanzanite is mined in the Merelani Hills in northern Tanzania, near the city of Arusha, beneath the majestic Mount Kilimanjaro.
Known properties of tanzanite
Color Stability
The color stability of tanzanite is very high. Heat-treated stones retain their shade for a long time, and it is very unlikely that tanzanite would change color under normal lighting or environmental temperatures. This makes it a reliable and durable gemstone.
Value of Tanzanite
Loose tanzanites with exceptional color are extremely rare gemstones and are often sought after by collectors and investors worldwide. These stones are frequently kept as investments with increasing value or used to create unique, designer jewelry pieces.
Hardness of Tanzanite
Compared to the traditional “big four” gemstones, tanzanite is significantly softer, with a hardness of approximately 6.5 on the Mohs scale. Because of this, its surface can be more susceptible to scratching if exposed to mechanical contact and requires careful handling.
Tanzanite Quality Factors
Larger tanzanites are significantly rarer because most stones are mined in smaller sizes. As a result, the price increases exponentially with carat weight.
Most tanzanites are visually very clean, without visible inclusions. Stones with exceptional clarity are more valuable, although small inclusions can sometimes give the gemstone a natural character.
Precise cutting is crucial for tanzanite, allowing the depth of color and play of light to fully develop. A proper cut enhances the intensity of blue and violet tones while giving the gemstone an elegant brilliance.
Tanzanite is famous for its fascinating play of colors, ranging from blue to violet depending on the angle of view. This optical phenomenon, known as pleochroism, makes every stone unique.
The most valuable tanzanites display a rich blue-violet shade that radiates elegance and depth. Heat treatment is commonly used to intensify the typical blue tone and highlight the gemstone’s natural brilliance.
Tanzanites often contain small inclusions, which are common and rarely affect their beauty. Higher-quality stones have excellent transparency and clarity, allowing them to reflect light more effectively and appear more vibrant.
Perfectly clean tanzanites are very rare and highly valued by collectors and jewelers.
Tanzanite is most commonly cut into oval, cushion, or pear shapes, which emphasize its characteristic play of blue and violet tones.
Because of its relatively high brittleness, cutting tanzanite requires precision and expertise to preserve its brilliance and color effects. A well-executed cut can significantly influence both the value and the visual appearance of the gemstone.
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