Beautiful, blue and so perfect for you! This Tanzanian green tanzanite will make a gorgeous pendant or a marvelous ring if you choose to go down that path. You can even put this rare beauty on display as part of your gem collection, too!
Typically blues and bluish-purples, tanzanite also comes in extremely rare and highly collectable fancy colors including green. Tanzanite is a challenging gemstone for the lapidary because of the orientation of crystals due to trichroism (three colors and their intensity change when viewed from different angles). As high transparency is a signature characteristic of Tanzanite, optimal lapidary with a good brilliance and eye-clean clarity, the highest quality clarity grade for colored gemstones, is critical.
Tanzanite was discovered in 1967 at the world's sole deposit not far from Tanzania's Mount Kilimanjaro and the town of Arusha in the arid Merelani foothills that rise from the hot Sanya plains. Segmented into four 'blocks' (A, B, C and D), the Tanzanite deposit scarcely covers 20 square-kilometers. A variety of the mineral Zoisite, 'Tanzanite' was named by Henry B. Platt, Former President & Chairman, Tiffany & Co. in tribute to the land of its birth.
As a sole source gemstone, tanzanite is much defined by its genuine rarity as its beauty. Overall tanzanite production is decreasing; it is estimated that there is less than 15 - 20 more years of tanzanite left in the ground. Tanzanite's rare fancy colors are highly coveted by collectors, but their supply is limited due to geological scarcity.
A popular jewelry gemstone, tanzanite has a Mohs' Hardness rating of 6.5 – 7.0 and should always be stored carefully to avoid scuffs and scratches. Clean with gentle soap and lukewarm water, scrubbing behind the gem with a very soft toothbrush as necessary. After cleaning, pat dry with a soft towel or chamois cloth.
As gem mines are becoming more and more depleted, gemstones of all types are becoming increasingly sought-after. Whether you are a collector or a first-time buyer, you will be amazed by the timeless glamor loose gems have to offer! They are fun to collect and look spectacular no matter how you display them. You can make an appointment with your jeweler to experience the joy of creating your very own, one-of-a-kind design. Choose from a variety of settings and styles to create a completely unique presentation that's sprung from your own imagination. Or display your loose gems under glass, showcasing rare and vibrant stones in an artistic and sophisticated manner. No matter how they're displayed, loose gemstones are brilliant collectibles for gem lovers and avid collectors alike!
All weights pertaining to gemstones, including diamonds, are minimum weights. Additionally, please note that many gemstones are treated to enhance their beauty. View Gemstone Enhancements and Special Care Requirements for important information.
Cut: Refers to the geometric shape and proportions of a gemstone. A gemstone’s cut is what most directly affects its sparkle or brilliance.
Facet: A flat cut on the surface of a gemstone.
Fire: Flashes of rainbow colors. Also called “dispersion.”
Hardness: Resistance to scratching. The higher the number, the more resistant.
Hue: Another word for color.
Luster: The shininess of a jewel.
Opaque: The opposite of transparent. Light cannot pass through an opaque gemstone, therefore they do not have any sparkle or fire.
Saturation: This term refers to how pure or deep a gemstone’s color is. Some gemstones, like aquamarine, have a naturally low saturation (very light blue) while other gemstones, like amethysts, can have very high saturation (rich, dark purple).
Sparkle: The white light leaving a jewel, traveling upward, which is visible to the eye. Sparkle is often referred to as “brilliance.”
Toughness: Resistance to breakage.
Gemstone Shapes & Cuts
These are the common shapes or cuts for gemstones, each lending a different look and allure.
Baguette: Baguette means “stick” or “rod” in French, which makes it a very appropriate name for this gemstone shape. Diamond baguettes are often used as accent stones to flank a primary stone.
Brilliant: Any gemstone cut with 58 facets, which produces the maximum possible sparkle. A brilliant cut can have several shapes, including round, oval, pear, radiant and heart.
Cabochon: This shape features a rounded, perfectly smooth surface instead of facets. It is the oldest gemstone shape and is commonly used with opaque stones such as opal, jade and turquoise.
Cushion: A very popular style for most of the 19th century, cushion shapes are slightly domed with rounded corners that make the stone look like a pillow. In fact, this shape is often referred to as a “pillow cut.” It looks particularly beautiful in candlelight.
Emerald: With its long, steep facets, emerald cuts tend to flash rather than sparkle.
Fancy: Technically, this term refers to any type of gemstone that isn’t round, but many jewelers reserve it to describe the more exotic gemstone shapes such as marquise, heart, pear and trillion.
Heart: Often described as a custom cut, heart-shaped gemstones are very popular for pendants.
Marquise: According to legend, this shape was commissioned by King Louis XV to resemble the smile of his mistress, Marquise de Pompadour. Ideal marquise cuts have a length to width ratio of 2:1.
Oval: Similar to the round shape, oval gemstones produce a high amount of sparkle and fire.
Pear: This is a classic teardrop shape that is ideal for earrings and pendants.
Princess: This a relatively new shape that combines the sharp, flat edges of an emerald shape with numerous small facets, which produce both sparkle and fire.
Radiant: This shape is similar to emerald, but it adds extra facets on the edges and corners to increase the gemstone’s sparkle.
Round: This classic shape produces maximum sparkle and fire, making it an ideal shape for diamonds.
Tapered Baguette: A tapered baguette is a baguette shape with one end that is narrower than the other.
Trillion: A very striking, usually three-sided shape, trillion gemstones (especially diamonds) are celebrated for the intense fire they produce.
The Mohs Scale
The most common measure of a gemstone's degree of hardness is based on the Mohs Scale. Devised by German geologist Friedrich Mohs in 1812, the Mohs Scale grades minerals on a comparative scale from 1 (very soft) to 10 (very hard).
Hardness is generally associated with durability and the ability to resist breakage. When referring to gemstones, however, hardness more accurately means the stone's ability to resist abrasion. What the scale means is that a mineral of a given hardness rating will scratch other minerals of the same rating, as well as any minerals of a lower hardness rating. For example, rubies and sapphires, which are composed of the mineral corundum and have a Mohs rating of 9, will scratch each other, as well as topaz (rating 8) and quartz (rating 7). But they will not scratch diamonds, which are rated 10 and considered the hardest substance.
The numeric values assigned to each interval of hardness are not equal. Some stones are disproportionately harder than others. Because Mohs Scale wasn't made for exact precision, it uses half numbers for in-between hardness ratings.
No other gemstone discovery has made a bigger impact on the jewelry market than the recent newcomer, tanzanite. Its luscious color, and the fact that the stone is found in only one location throughout the world, makes tanzanite an exceptionally rare, valuable and highly sought-after gem.
Tanzanite’s mesmerizing saturation of color is what has made the stone so popular. It is the blue variety of the mineral zoisite and occurs in a beautiful range of colors. Rarely pure blue, the gem almost always displays signature overtones of purple. In smaller sizes, it tends toward light tones such as lavender, while in larger sizes, the gem typically displays deeper, richer blues and purples. The finest quality tanzanite is usually deep blue or violet, which is extremely spectacular in sizes above ten carats.
Tanzanite is pleochroic, meaning it shows the appearance of several colors in the same stone, depending on perspective. From different angles, the gem can appear blue, purple, yellow, grey or brown. Most rough crystals show a large proportion of brown shades, since tanzanite in its natural form is typically brown with red, orange, yellow or bronze hues.
Gem cutters may change this coloring by heating the stone to 500°C. This heat treatment releases the intense violet-blue colors for which the stone is famous. According to legend, the effect of heat on tanzanite was first discovered when brown zoisite crystals were caught on fire by a lightning strike. Local cattle herders noticed the beautiful blue crystals sparkling in the sun and picked them up, becoming the first tanzanite collectors.
The gem was first discovered near the base of Mount Kilimanjaro in the Merelani Hills of east-African Tanzania in 1967. This breathtaking location is the only known mining site on Earth for tanzanite. Right after its discovery, New York jeweler Louis Comfort Tiffany was presented with the first stones. Knowing it was going to be a sensation, he recommended finding a new name for the gem, since the gemological denomination “blue zoisite” reminded him of the word “suicide.” Tiffany suggested the name tanzanite, derived from its place of occurrence, and the new name quickly became established on the market. Tiffany & Co introduced the stone to the public in a spectacular promotional campaign two years after it had been discovered. It was enthusiastically celebrated as the “Gemstone of the 20th Century.”
A noted 122.70ct faceted tanzanite dubbed the “Midnight Blue” is on display at the Smithsonian Institution in Washington, D.C. In 1996, a 255.00ct tanzanite crystal was discovered near Arusha, but because of its many inclusions, it proved to be of little market value. Tanzanite ranks a hardness of 6.5-7.0 on the Mohs Scale and has become the traditional gift for couples celebrating their 24th anniversaries.
High-quality and larger-size tanzanites can be sold at extremely premium prices. Although demand for this beautiful gem continues to grow, supply shortages in recent years have hampered production and caused price fluctuations. In 1998, the weather phenomenon known as “El Nino” soaked Tanzania with heavy rains during what should have been the drought period. When the monsoons hit, the groundwater swells were high and caused devastating floods. Mines caved in and all hopes of finding additional tanzanite rough were swept away.
Because it is such a new gemstone, there is little folklore, superstitions or healing properties surrounding tanzanite. Some believe the stone helps people to be more practical, realistic and honest. It is thought to uplift and open the heart while helping one cope with change.