Tanzanite, a striking blue to violet gemstone, has captivated gem enthusiasts and collectors since its discovery in the 1960s. Originating from the Merelani Hills of Tanzania, this rare gem is renowned for its remarkable color and pleochroism, which allows it to exhibit different colors when viewed from different angles. However, a common debate among gem lovers centers on whether blue or purple tanzanite is superior. In this article, we will delve into the characteristics of both blue and purple tanzanite, compare their qualities, and explore which color holds the title of being the “superior” tanzanite.
The Discovery and Origins of Tanzanite
Tanzanite was discovered in 1967 by a Maasai tribesman named Ali Juuyawatu in the Merelani Hills of Northern Tanzania. This gem, a variety of zoisite, was initially mistaken for sapphire due to its deep blue hue. However, subsequent analysis revealed its unique chemical composition and properties, distinguishing it from other gemstones. Tiffany & Co. recognized its potential and named it “tanzanite” after its country of origin, Tanzania.
The Science Behind Tanzanite’s Color
The mesmerizing colors of tanzanite are due to trace amounts of vanadium within its crystal structure. When the gem undergoes heat treatment, which is a common practice, the vanadium causes the stone to exhibit its characteristic blue and violet hues. Tanzanite is also known for its pleochroism, displaying different colors—typically blue, violet, and burgundy—when viewed from different crystallographic directions.
Pleochroism and Its Impact on Color Perception
Pleochroism is a key feature of tanzanite, making it a fascinating gemstone. This optical phenomenon means that tanzanite can show multiple colors depending on the angle of light and the direction from which it is viewed. While blue is generally the most prized and marketed color, the presence of purple and violet hues adds to its allure.
Characteristics of Blue Tanzanite
Color and Appeal
Blue tanzanite, often described as a vivid or deep blue, is the most sought-after color variant. Its rich blue hue is comparable to fine sapphires, which contributes to its popularity. The market favors blue tanzanite because of its rarity and the perception that blue is a more traditional and desirable color for gemstones.
Market Value
Blue tanzanite typically commands higher prices in the market due to its perceived rarity and desirability. Gemstones with a pure blue color and minimal violet or purple undertones are especially valuable. The deeper and more saturated the blue, the higher the price tag.
Rarity
While all tanzanite is considered rare, blue tanzanite is perceived as rarer than its purple counterpart. This rarity is due in part to the market’s preference for blue stones and the difficulty in finding naturally blue tanzanite without significant violet hues.
Characteristics of Purple Tanzanite
Color and Appeal
Purple tanzanite, ranging from light lavender to deep violet, offers a unique and captivating beauty. The purple shades of tanzanite are often seen as more exotic and can be incredibly vibrant. These stones can also exhibit flashes of red and pink, adding to their visual interest.
Market Value
While purple tanzanite is generally less expensive than blue tanzanite, it is still highly valued for its beauty and uniqueness. The market for purple tanzanite is growing, with collectors and gem enthusiasts appreciating the stone’s distinct color. The presence of strong violet and purple hues can enhance the gem’s appeal, especially for those seeking something different from the traditional blue.
Rarity
Purple tanzanite is more common than pure blue tanzanite, contributing to its lower market value. However, its rarity compared to other gemstones still makes it a prized addition to any collection. The distinctiveness of purple tanzanite, with its ability to display a range of colors, ensures its continued appeal.
Factors Influencing Value
Clarity
Both blue and purple tanzanite are graded based on their clarity. Gemstones with fewer inclusions and greater transparency are more valuable. Clarity impacts the overall appearance of the gem, with cleaner stones exhibiting more brilliance and color.
Cut
The cut of tanzanite plays a crucial role in maximizing its color and brilliance. Skilled gem cutters can enhance the stone’s natural pleochroism, ensuring that the most desirable colors are visible. A well-cut tanzanite will show its blue and purple hues in a balanced and visually appealing manner.
Carat Weight
As with most gemstones, larger tanzanites are rarer and more valuable. The value of blue and purple tanzanite increases with size, but the quality of color and clarity remains paramount. Large stones with exceptional color and clarity are particularly prized.
Blue vs. Purple Tanzanite: A Comparative Analysis
Color Preference
The preference for blue or purple tanzanite often comes down to personal taste. Blue tanzanite is seen as more traditional and classic, making it a popular choice for fine jewelry. On the other hand, purple tanzanite offers a unique and exotic alternative, appealing to those looking for something different.
Market Demand
The market demand for blue tanzanite is generally higher due to its perceived rarity and traditional appeal. This higher demand results in higher prices for blue tanzanite. However, purple tanzanite is gaining recognition for its beauty and uniqueness, leading to increased interest and value over time.
Investment Potential
For investors, blue tanzanite may offer better potential returns due to its higher market value and demand. However, purple tanzanite can also be a valuable investment, particularly as its popularity grows. Both colors offer excellent investment opportunities, depending on market trends and individual preferences.
See Also: How to Care for Tanzanite and Gold Jewelry
Practical Considerations
Jewelry Design
When choosing between blue and purple tanzanite for jewelry, consider the overall design and intended use. Blue tanzanite is often preferred for classic and elegant pieces, while purple tanzanite can add a touch of uniqueness and flair. Both colors can be set in a variety of metals, including white gold, yellow gold, and platinum, to enhance their beauty.
Durability
Tanzanite has a hardness of 6.5 to 7 on the Mohs scale, making it suitable for most types of jewelry but requiring care to avoid scratches and damage. Both blue and purple tanzanite should be worn with caution, especially in rings and bracelets that are more prone to impact.
Care and Maintenance
To maintain the beauty of tanzanite, avoid exposing it to harsh chemicals, extreme temperatures, and ultrasonic cleaners. Clean tanzanite jewelry with mild soap, water, and a soft brush. Proper care ensures the longevity and brilliance of both blue and purple tanzanite.
Conclusion
Determining whether blue or purple tanzanite is superior ultimately depends on individual preferences and values. Blue tanzanite is often regarded as superior due to its higher market value, rarity, and traditional appeal. Its deep blue hue is widely admired and sought after, making it a staple in fine jewelry collections.
However, purple tanzanite offers its own set of unique advantages. Its vibrant and exotic colors appeal to those looking for something distinctive and less conventional. As the market for purple tanzanite grows, its value and recognition continue to rise, making it a worthy contender in the world of gemstones.
In the end, the superiority of blue or purple tanzanite is subjective and varies from person to person. Both colors possess exceptional beauty, rarity, and allure, making them prized choices for collectors and enthusiasts. Whether one prefers the classic elegance of blue tanzanite or the striking uniqueness of purple tanzanite, both gemstones offer a captivating glimpse into the natural wonders of the Earth.
