Determining Authenticity: Identifying Genuine Tanzanite Stones
Tanzanite is a truly remarkable gemstone, known for its vibrant blue-violet color and exquisite beauty. However, with its growing popularity and value, the market has seen an increase in counterfeit tanzanite stones. To ensure that you are investing in genuine tanzanite, it is important to understand the characteristics of authentic stones and the techniques for identifying them.
Understanding Tanzanite: Origin and Characteristics
Tanzanite is a rare form of the mineral zoisite that was first discovered in Tanzania in 1967. What makes tanzanite unique is its geological formation. It is created through a combination of intense heat and pressure deep within the Earth's crust. This process imparts the extraordinary blue-violet color that tanzanite is famous for.
Authentic tanzanite stones typically exhibit a range of colors, from blue to violet, and may even display hints of pink and red when viewed from different angles. Their color intensity is influenced by factors such as size, clarity, and the presence of pleochroism – the ability to show different colors depending on the viewing angle.
The Unique Formation of Tanzanite
Millions of years ago, tanzanite was formed in the foothills of Mount Kilimanjaro, where a geological phenomenon led to its creation. The explosion of Mount Kilimanjaro's volcano caused the earth's crust to shift, allowing tanzanite-rich magma to be pushed towards the surface. Over time, weathering and erosion exposed these tanzanite deposits, making them accessible for mining.
This remarkable and singular formation process makes tanzanite one of the most captivating gemstones in the world.
Tanzanite's journey from deep within the Earth's crust to the surface is a fascinating one. As the magma containing tanzanite minerals rose towards the surface, it encountered different layers of rock and minerals. This interaction, combined with the intense heat and pressure, transformed the minerals into the beautiful gemstone we know today.
During this transformation, the tanzanite crystals grew and developed their unique crystal structure. The crystal lattice of tanzanite is composed of interconnected atoms arranged in a specific pattern, which contributes to its optical properties and color.
Key Features of Tanzanite Stones
In addition to their mesmerizing color, authentic tanzanite stones possess several key features that set them apart from imitations. These features include:
- Refractive Index: Genuine tanzanite stones have a refractive index of 1.692-1.700. This measurement plays a crucial role in how light interacts with the gemstone, contributing to its brilliance and sparkle.
- Hardness: Tanzanite has a hardness of 6.5-7 on the Mohs scale. While it is relatively durable, it requires proper care and protection to maintain its luster and beauty.
- Clarity: Authentic tanzanite stones may contain inclusions, which are natural characteristics formed during their geological journey. These inclusions, if present, should be evaluated for their impact on the overall beauty and value of the stone.
- Color Zoning: Tanzanite stones often exhibit color zoning, with variations in intensity across the gem. This phenomenon can enhance the uniqueness and allure of the stone when properly balanced.
- Trichroism: Genuine tanzanite displays trichroism, meaning it shows different colors when viewed from different angles. This optical property is a key characteristic to be considered during the identification process.
When evaluating tanzanite stones, gemologists take into account these key features to determine their quality and value. Each tanzanite gemstone is unique, with its own combination of color, clarity, and optical properties, making it a truly remarkable and sought-after gemstone.
The Importance of Authenticity in Gemstones
When it comes to acquiring gemstones like tanzanite, authenticity is of utmost importance. Understanding the value and rarity of genuine tanzanite, as well as the risks associated with counterfeit stones, is crucial for both buyers and enthusiasts alike.
Value and Rarity of Genuine Tanzanite
Genuine tanzanite holds significant value due to its rarity. The only known deposits of tanzanite are situated in a small mining area in Tanzania, making it an exceptionally scarce gemstone. As a result, the demand for authentic tanzanite stones continues to rise, contributing to their increasing value.
Tanzanite's rarity can be attributed to several factors. Firstly, the gemstone's formation process is unique and requires specific geological conditions. Tanzanite is formed in the foothills of Mount Kilimanjaro, where intense heat and pressure transform certain minerals into this stunning blue-violet gemstone. The geological forces necessary for tanzanite's creation are incredibly rare, further enhancing its scarcity.
Furthermore, the limited mining area in Tanzania adds to the gemstone's exclusivity. The mines in Merelani Hills are the sole source of tanzanite, and their production capacity is finite. As the mines continue to be depleted, the supply of genuine tanzanite becomes increasingly limited, driving up its value in the market.
It is essential to recognize that the value of tanzanite is influenced by various factors such as size, color, clarity, and the presence of inclusions. Larger tanzanite stones are generally more valuable, especially if they exhibit a rich, deep blue hue. The presence of inclusions, which are natural imperfections within the gemstone, can also affect its value. Tanzanite with minimal inclusions is considered more desirable and commands a higher price.
Additionally, tanzanite's color plays a crucial role in determining its worth. The gemstone's color ranges from pale blue to intense violet-blue, with the latter being the most prized. The depth and saturation of the blue-violet hue contribute to the gemstone's allure and rarity.
Investing in certified and genuine tanzanite stones ensures that you are getting the best value for your investment. Certified gemstones come with documentation that verifies their authenticity and provides detailed information about their characteristics. This documentation, often issued by reputable gemological laboratories, gives buyers confidence in the quality and value of the tanzanite they are purchasing.
By understanding the value and rarity of genuine tanzanite, buyers can make informed decisions and avoid the pitfalls of counterfeit stones. The allure of tanzanite lies not only in its stunning beauty but also in its exclusivity and scarcity. Acquiring an authentic tanzanite gemstone is a testament to one's appreciation for the natural wonders of the Earth and a valuable addition to any collection.
