Tanzanite Vodka in Gift Box - 70cl Premium French Vodka

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National Environment Statistics Report - Tanzania Mainland" (PDF). National Bureau of Statistics (NBS) (Tanzania). June 2018 . Retrieved 27 June 2020. Tanzanite forms as a brownish crystal and is trichroic, which means it shows three colors – brown, blue and violet – concurrently. Heating, either underground naturally by metamorphic processes, or artificially, removes the brown or burgundy color component to produce a stronger violet-blue color and makes the stone "dichroic", which means it only reflects blue and violet. [30] Rarely, gem-quality tanzanite will heat to a green primary hue, almost always accompanied by a blue or violet secondary hue. These green tanzanite have some meaningful value in the collector market, but are seldom of interest to commercial buyers. [31] Eugenia Sheppard (3 October 1968). Section B. "Inside Fashion: Something new at Tiffany's is Tanzanian blue gem". Durham Morning Herald (finaled.). Durham, N.C.: The Durham Herald Co.: 2B. OCLC 9519676.

Merelani, Tanzania". The Mineralogical Record. Archived from the original on 7 August 2010 – via minrec.org. E. Skalwold. "Pleochroism: trichroism and dichroism in gems". Nordskip.com. Archived from the original on 6 September 2012 . Retrieved 29 August 2011.

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Weldon, Robert. "An introduction to gem treatments". gia.edu. Gemological Institute of America, Inc.

Study of Heat Treatment". Yourgemologist.com. International School of Gemology . Retrieved 29 August 2011.There are many accounts of the discovery of tanzanite, but only one recognised by the government of Tanzania. In January 1967, Jumanne Mhero Ngoma (originally from Same District, Kilimanjaro) stumbled upon the sparkling blue stones at the Mererani hills in the Kiteto district of the then Arusha Region (presently Manyara Region). He was issued with a certificate of recognition three years later by the then President Julius Nyerere and a financial reward of Tsh 50,000 for his efforts. In 1984, he was issued with a certificate for scientific discovery by the Tanzania Commission for Science and Technology. [10] [11] Commercial history [ edit ] Craft work on tanzanite

Export ban on tanzanite in Africa leaves Jaipur gems sector in lurch". The Times of India. 3 October 2013. Archived from the original on 29 December 2013 . Retrieved 31 December 2013.Tanzanite is noted for its remarkably strong trichroism, appearing alternately blue, violet and burgundy depending on crystal orientation. [6] Tanzanite can also appear differently when viewed under different lighting conditions. The blues appear more evident when subjected to fluorescent light and the violet hues can be seen readily when viewed under incandescent illumination. In its rough state tanzanite is colored a reddish brown to clear, and it requires heat treatment to remove the brownish "veil" and bring out the blue violet of the stone. [7] Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1995). Handbook of Mineralogy, Vol. 2. Mineral Data Publishing. p.901. ISBN 978-0-9622097-0-3. verifyErrors }}{{ message }}{{ /verifyErrors }}{{

From 1967, an estimated two million carats of tanzanite were mined in Tanzania before the mines were nationalized by the Tanzanian government in 1971. Lower grades of tanzanite are occasionally enhanced using a layer of cobalt, as cobalt imparts a deeper shade of blue. The cobalt layer does not adhere well to these stones, and tends to rub off over time, resulting in a much less intensely colored stone. Though still tanzanite, the practice of cobalt coating is considered deceptive unless well-advertised. [36] See also [ edit ] Mgunduzi wa madini Tanzanite afariki dunia". BBC News Swahili (in Swahili) . Retrieved 26 September 2023.Luvanda, H. E. Baraka H. (10 October 2018). "Presentation of Tanzania High Commissioner Of Tanzania Minerals And Metals Outlook, 2030". The High Commission of the United Republic of Tanzania . Retrieved 27 June 2020. Briggs, Philip; McIntyre, Chris (2013). Tanzania Safari Guide: With Kilimanjaro, Zanzibar and the Coast. Bradt Travel Guides. p.104. ISBN 978-1-84162-462-4.