1.61 ct HKD-Certified Natural Round-cut Bluish-Violet VVS Tanzanite (Tanzania). This gem has never been used/placed/set in a setting. It is utterly undamaged, unmarred and in perfect condition as expected of NWOTags.I have included a Tanzanite article below for your appreciation and enjoyment. Tanzanite is usually heat-treated to enhance its blue and violet colors. Most rough crystals show a large proportion of brownish-yellow tints, which vanish when heated to 752-932 degrees F (400-500 degrees C). All reputable gem traders declare such enhancements, however routine they may be. This Tanzanite is sealed in its HKD-certification document as a package (see photos) -- captej2012.
Size: 7.01mm x 6.95mm x 4.43mm. Treatment: Heated, Not Enhanced (per HKD certificate). The Kids were Young when We called the Sky Big&Blue.
When Such are the Sentiments to be Stored in a Stone, What Better than the Blue Depths of a Tanzanite? I brought Big&Blue home to Contain the Moments. Moments when Family was their Only World.
When Innocence, a Chance for Wonder. When Laughter, a Note of Joy. When Song, a Lack of Fear. Big&Blue saw My Love drive me in Everything. I Worked and Gave My All for Family.
Still could I have Done Better and Provided More? Big&Blue says Nay, One's Best is All Any Can Do. Stay here, look around and learn. We pride ourselves as good-spirited folks having fun and doing our best to share the joy of Nature's most beautiful and enduring literal treasure -- Natural Gemstones. Expect to find us cheerful and trustworthy, and we will expect the same of you.About Tanzanite - History and Introduction. Tanzanite is a blue to violet gemstone which is a member of the zoisite mineral group. It was discovered in 1967 by Masai tribesman, Ali Juuyawatu in the hills of Northern Tanzania, which remains the sole source of Tanzanite to this day. Tanzanite was given its name by Tiffany & Co, who promoted the gemstone, resulting in its sudden popularity. Which means that it shows different colours depending on the viewing angle. In order to get the preferred blue or violet-blue hue, gem cutters must properly orient tanzanite gemstones. The vivid blue of tanzanite can rival fine sapphire and makes tanzanite an extremely desirable gemstone. This attractive colour is so sought after that tanzanite is routinely heated to enhance fine blue and violet hues and minimize the less desirable brownish tones.
Tanzanite ranges from ultramarine to sapphire blue in colour. It can also appear blue-violet.
It is best identified by its refractive index (1.691 to 1.700) and density of 3.35. Its orthorhombic crystal system can also help to distinguish it from some similar gemstones, such as amethyst. Tanzanite exhibits perfect cleavage with an uneven fracture.Tanzanite; Origin and Gemstone Sources. Tanzanite is only found in one place on earth; Tanzania, East Africa. The only known deposit of tanzanite is located on a five square mile hilltop at Merelani Hills near Ausha, ten miles south of the Kilimanjaro International Airport in Tanzania. Tanzanite ranges in colour from ultramarine to sapphire blue.
Under artificial light, it may appear more violet. Tanzanite's pleochroism means that it can appear blue or violet when viewed from different angles.
Tanzanite has a higher colour saturation in gemstones of over 5 carats. The most desirable colour for tanzanite gemstones is a deep saturated blue or violet-blue. Tanzanite has an attractive vitreous lustre.
Eye-visible inclusions decrease the value of tanzanite, except in the very rare cat's eye tanzanite, which has desirable inclusions. That cause chatoyancy (the cat's eye effect). Tanzanite is mostly faceted in both traditional and fancy shapes and a variety of cutting styles. When cutting tanzanite, lapidarists generally take cost into consideration, which means that tanzanite is often cut into ovals and cushions. The gemstone's main colour depends on the orientation of the cut.Extremely rare cat's eye tanzanite is cut en cabochon to display the desired chatoyancy. Tanzanite is usually heat-treated to enhance its blue and violet colours. Most rough crystals show a large proportion of brownish-yellow tints, which vanish when heated to 752-932 degrees F (400-500 degrees C) All reputable gem traders declare such enhancements, however routine they may be. The item "1.61 ct HKD-Certified Natural Round-cut Bluish-Violet VVS Tanzanite (Tanzania)" is in sale since Sunday, April 14, 2019. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Tanzanite". The seller is "captej2012" and is located in Canyon Country, California. This item can be shipped worldwide.