Tanzanite Sterling Silver Rings

Tanzanite is an extremely rare gemstone that only comes from, as the name suggests, Tanzania. Given that it is only mined in Tanzania whereas sapphires are mined worldwide, demonstrates just how incredibly rare tanzanite stones are.

Tanzanite is a strikingly beautiful gemstone that has captured the attention of gem enthusiasts and collectors worldwide. Known for its mesmerizing deep blue to violet hues, tanzanite is relatively young in the world of gemstones, having only been discovered in the 1960s. It is a variety of the mineral zoisite, and its striking colour and rarity have made it one of the most sought-after gemstones in recent decades.

Discovery and Origin

Tanzanite was first discovered in 1967 by a Maasai tribesman named Ali Juuyawatu in the Merelani Hills of northern Tanzania, near the foot of Mount Kilimanjaro. The discovery was a lucky one, as the gemstone’s vibrant blue and violet shades immediately caught the attention of gem dealers and geologists. Tanzanite is one of the rarest gemstones on Earth, found only in a small area of Tanzania, which makes it incredibly unique and valuable.

The gemstone was initially marketed under the name "blue zoisite" but was later rebranded as "tanzanite" by Tiffany & Co. after the location of its discovery—Tanzania. The gemstone's name not only ties it to its geographic origin but also evokes an image of the stunning landscape of East Africa, where the stone is mined.

Physical Properties

Tanzanite belongs to the zoisite mineral group and is classified as a calcium aluminium silicate. What sets tanzanite apart from other gemstones is its distinctive pleochroism, meaning it displays different colours when viewed from different angles. In tanzanite, this effect reveals shades of blue, violet, and sometimes even burgundy, depending on the angle and lighting. The most prized tanzanite stones exhibit a rich, deep blue or violet-blue colour, which is enhanced by the gemstone’s unique internal structure.

Tanzanite has a hardness of 6.5 to 7 on the Mohs scale, making it relatively softer than other popular gemstones like sapphire or diamond. While it is durable enough for use in jewellery, it is more prone to scratching and damage compared to harder stones, which requires care in everyday wear.

Rarity and Value

What makes tanzanite particularly valuable is its extreme rarity. It is found in only one location in the world—the Merelani Hills of Tanzania. The mining area is relatively small, and the supply of tanzanite is limited, leading to higher demand and increasing value. Additionally, tanzanite is considered a “one-time” gemstone, meaning that the mines where it is extracted are not expected to last indefinitely. This further elevates the gem’s status and makes it a coveted piece for collectors.

The price of tanzanite can vary greatly, depending on factors such as colour, clarity, size, and cut. The most valuable tanzanite stones exhibit a deep, rich blue with minimal inclusions. However, even smaller stones can command high prices due to their rarity.

Tanzanite in Jewellery

Tanzanite's captivating colours and relatively affordable price compared to other high-end gemstones like sapphire have made it a popular choice in fine jewellery. It is commonly found in rings, necklaces, earrings, and bracelets. Its stunning blue-violet hue makes it a striking centre stone for engagement rings, as it offers a unique alternative to the traditional diamond.

Given its softer nature, tanzanite is often set in protective settings, such as bezel or halo designs, to minimize the risk of damage. Because of its vibrant colour, it pairs beautifully with a variety of metals, including platinum, white gold, and yellow gold.

Conclusion

Tanzanite is a gemstone that captures the imagination with its rare, vivid colours and intriguing history. Its connection to the exotic landscapes of Tanzania, combined with its exceptional beauty, has ensured its place as one of the most desirable gemstones in the world. Whether you're a jewellery collector, an enthusiast, or simply someone who appreciates the wonders of the natural world, tanzanite is a gemstone that never fails to impress.

Tanzanite FAQ

What is tanzanite?
Tanzanite is a beautiful blue to violet variety of the mineral zoisite. It is known for its striking pleochroism, meaning it can display different colours (blue, violet, and sometimes burgundy) depending on the angle it is viewed from. Tanzanite is found only in a small area near Mount Kilimanjaro in Tanzania, making it one of the rarest gemstones on Earth.
Where is tanzanite found?
Tanzanite is found exclusively in the Merelani Hills of northern Tanzania. This small mining region, situated near Mount Kilimanjaro, is the only known source of tanzanite, making it incredibly rare and valuable.
What makes tanzanite so special?
Tanzanite’s beauty and rarity set it apart from other gemstones. It is known for its stunning blue to violet colour and unique pleochroism, where the gemstone changes colour depending on the angle from which it is viewed. Its limited geographic source adds to its exclusivity and allure, making tanzanite a highly coveted gemstone in the world of fine jewellery.
How is tanzanite formed?
Tanzanite forms under high pressure and heat conditions deep within the Earth’s crust. It is a variety of zoisite, a mineral group that forms in metamorphic rocks. The gemstone's blue and violet colours are primarily due to trace amounts of vanadium and chromium in its crystal structure.
What does pleochroism mean in tanzanite?
Pleochroism refers to a gemstone’s ability to exhibit different colours when viewed from different angles. In the case of tanzanite, it can appear blue, violet, or even burgundy, depending on the viewing angle. This characteristic makes tanzanite even more captivating, as its colours seem to shift in different lighting and perspectives.
What is the hardness of tanzanite?
Tanzanite has a hardness of 6.5 to 7 on the Mohs scale, which makes it relatively soft compared to other gemstones like sapphires (9 on the Mohs scale) or diamonds (10). While it is durable enough for use in jewellery, tanzanite should be handled with care to prevent scratches or damage, especially in pieces worn daily.
Is tanzanite expensive?
Tanzanite can be expensive, especially for larger stones with the most desirable colour—deep blue or violet. Prices are influenced by factors such as colour, clarity, size, and cut. Because tanzanite is found in only one location in the world, its rarity adds to its value. However, it is generally considered more affordable than other precious gemstones like diamonds or sapphires.
How can I care for my tanzanite jewellery?
To keep your tanzanite jewellery looking beautiful, it’s important to handle it with care. Avoid exposure to harsh chemicals, such as household cleaners or perfumes, and store it separately from other gemstones to prevent scratches. When cleaning tanzanite, use a soft cloth or a mild soapy solution with lukewarm water. Avoid ultrasonic cleaners or steam cleaners, as they can damage the gemstone.
Can tanzanite be worn daily?
Tanzanite can be worn daily, but because it is relatively soft compared to other gemstones, it’s important to take precautions. Be mindful of activities that could cause the gemstone to scratch or chip, like heavy lifting or rough handling. A protective setting (such as a bezel or halo setting) can help shield the stone from damage.
What is the best way to choose a tanzanite gemstone?
When selecting a tanzanite gemstone, consider the following factors:
  • Colour: The most sought-after tanzanite stones are those with a rich, deep blue or violet-blue hue.
  • Clarity: Like most gemstones, tanzanite can have inclusions. Stones with minimal inclusions are considered more valuable.
  • Cut: The cut of the gemstone affects how well it displays its pleochroism. A well-cut tanzanite maximizes its colour and brilliance.
  • Size: Larger tanzanites can be more expensive due to their rarity, but the size should also align with your preferences and budget.
Is tanzanite treated in any way?
Tanzanite is sometimes heat-treated to enhance its color. Heat treatment is a common and accepted practice in the gemstone industry and is used to bring out the vivid blue and violet hues that tanzanite is known for. Always ask for documentation from your jeweller to confirm whether the tanzanite has been treated.
How is tanzanite used in jewellery?
Tanzanite is commonly used in a variety of jewellery pieces, including rings, necklaces, earrings, and bracelets. Its rich colour makes it an excellent choice for engagement rings, often paired with diamonds or other gemstones. Tanzanite looks stunning in both modern and classic jewellery designs, and its versatility makes it suitable for many different settings and metal types
Why is tanzanite considered a "one-time" gemstone?
Tanzanite is considered a "one-time" gemstone because the mines in Tanzania are expected to eventually be depleted. This makes tanzanite an increasingly rare and finite resource, which drives both its desirability and value. Some experts predict that tanzanite could become even more valuable in the future as supplies dwindle.
What is the best way to buy tanzanite?
When purchasing tanzanite, it’s important to buy from a reputable jeweller who can provide documentation about the stone’s authenticity and any treatments it may have undergone. Look for a jeweler who offers a warranty or return policy and ensures that the tanzanite is ethically sourced. If you're buying a larger or high-value tanzanite, consider having the stone independently appraised.
What birthstone is tanzanite associated with?
Tanzanite is one of the modern birthstones for the month of December, along with turquoise and zircon. Its rich, captivating colours make it an ideal birthstone for those born in December, symbolizing strength, beauty, and rarity.