Tanzanite

Tanzanite is the blue/purple variety of the mineral zoisite. (a calcium aluminium hydroxy silicate) It was discovered in the Mererani Hills of Manyara Region in Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. This is only known source in the world and has been depleted over the years. Naturally-formed tanzanite is extremely rare.

TanzaniteOne Mining Ltd. is a gemstone mining company which exclusively mines the blue gemstone. TanzaniteOne Mining Ltd is a fully owned subsidiary of the London AIM listed resource company, Richland Resources.( AIM : RLD )

Tanzanite is a relatively new gemstone in the world of gemology and jewelry. Since its discovery, tanzanite has sold for as little as $20 per carat and as much as $1,000 per carat or more, for gem-quality, finely coloured stones. That price may seem like a bargain in time, as tanzanite is a single-source gemstone and that source is expected to be mined out within the next 20 to 30 years based on the latest mining information.

Tanzanites are typically blue or violet-blue, but they can also be rare greenish and greenish-blue shades. Tanzanite is a highly pleochroic gem, meaning it can appear blue from one angle and violet or violetish-blue from another. Vanadium is the main coloring agent required to produce the rich blue-violet colors that are so highly prized.

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See -------> http://pennystockjournal.blogspot.ca/2014/01/turkish-diaspore.html

Petra Diamonds sells 29.62-carat blue diamond for $25,555,555

(IDEX Online News) – Petra Diamonds has sold a 29.62-carat blue diamond recovered from the Cullinan mine in South Africa in January for $25,555,555, or $862,780 per carat. The diamond was bought for Cora International NY through the South African company Golden Yellow Diamonds. Petra CEO Johan Dippenaar said, "This sale result affirms this stone as one of the most important blue diamonds ever recovered. "

http://idexonline.com/portal_FullNews.asp?id=39123&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+IdexOnline-News+%28IDEX+Online+-+News%29

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LONDON (Reuters) - An "outstanding vivid blue" 29.6 carat diamond has been recovered from Petra Diamonds' Cullinan mine in South Africa. (LON:PDL) The mine, owned by the firm since 2008, was where the Cullinan Diamond was found in 1905 - the largest rough gem diamond ever recovered and weighing 3,106 carats. Other notable diamonds include a 25.5 carat blue diamond, discovered in 2013 and sold for $16.9 million, and a diamond found in 2008, known as the Star of Josephine, which brought $9.49 million.

A recent find by Petra Diamonds. The 29.6-carat stone was recovered at its Cullinan mine, about 40km (25 miles) north-east of Pretoria. Petra unearthed another 25.5 carat blue diamond which sold for $16.9m in 2013.

http://www.mineweb.com/mineweb/content/en//mineweb-fast-news?oid=226061&sn=Detail


See ---> http://pennystockjournal.blogspot.ca/2013/07/the-cullinan-diamond.html