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en.wikipedia.org/wiki/Tanzanite

Tanzanite is the blue and violet variety of the mineral zoisite belonging to the epidote group. The gemstone was discovered by Jumanne Ngoma in the Merelani Hills of Manyara Region in Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. Tanzanite is only found in Tanzania, in a very small mining ...

geology.com/gemstones/tanzanite

Tanzanite is a rare blue gem and a popular alternative to blue sapphire. It is mined commercially at only one location in Tanzania.

www.tanzanitejewelrydesigns.com/tanzanite-faq

Everything you wanted to know about Tanzanite and where Tanzanite comes from. Learn about what it is, how rare it is, and why people value it so much making it one of the most popular stones in 2018.

www.lapigems.com/gemstones.asp

Lapigems Gem Company features a large selection of fine loose gemstones, specializing in rare Tanzanite and Tsavorite gemstones and gem stone information. Also tourmaline and malaia garnets. Fine East African Gemstones, Collector Quality Tanzanite, Tsavorite, Tourmaline Gemstones.

www.gia.edu/tanzanite

Peridot. Found in lava, meteorites, and deep in the earth's mantle, yellow-green peridot is the extreme gem. reading. Fancy Color Diamond. Dazzling brilliance. Captivating color. These are the planet's most valued gems. reading. Diamond. Diamonds are among nature's most precious and beautiful creations. reading ...

www.gemsociety.org/article/tanzanite-jewelry-and-gemstone-information

Tanzanite Value. In general, tanzanites showing more blue are valued higher than those showing more violet. Medium dark colors are the ideal. Custom cuts add value. As always, size and clarity have a strong effect on prices. Large clean rough is extremely scare. Ultra-rare cat's eye tanzanites are highly prized.

knowledge.wharton.upenn.edu/article/rare-beautiful-stone-fails-shine-tanzanias-missed-opportunity

Dec 20, 2013 ... Tanzanite is one of the rarest gemstones on earth and one of the most undervalued relative to its rarity. Given its scarcity, it would be reasonable to assume that it would sell at a high premium. Yet, with the price per carat ranging between US$300 and US$600, it sells for far less than diamonds.

financesonline.com/10-really-expensive-gemstones-from-tanzanite-to-pink-star-diamond

Jan 17, 2018 ... Shopping for these precious stones for your collection tend to be confusing as prices may vary from various pieces of jewelry and stones, especially when they appear to be similar. Before spending a fortune, know what you're getting yourself into – is it natural, genuine, synthetic, simulated or treated?

www.richlandgemstones.com/tanzanite-buying-guide/tanzanite-internet-myths

Gemstone Mining Company. Specialists in exceptional, loose tanzanite stones of the finest quality and unique multicolored Australian sapphires.