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News & Articles - All About Gemstones - GIA

Research & News provides GIA's latest industry exploration and findings.

Business, farming and industry related items for sale ...

Buy or sell business, farming and industrial supplies, machinery and tools. Also find businesses for sale as well as equipment for shops, hotels, guest houses, restaurants, offices and more.

Tanzanite: What you need to know about color, rarity, value

What is Tanzanite? Tanzanite is a trade name that was first used by Tiffany and Company for gem-quality specimens of the mineral zoisite with a blue color. Tiffany could have sold the material under the mineralogical name of "blue zoisite," but they thought the name "tanzanite" would stimulate customer interest and be easier to market.

Mining accident - Wikipedia

A mining accident is an accident that occurs during the process of mining minerals.Thousands of miners die from mining accidents each year, especially from underground coal mining, although hard rock mining is not immune from accidents.

Wolframite Mineral Information photos and Facts, tungsten ore

Scientific facts about the tungsten ore mineral Wolframite, including characteristics and occurances

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The Knowledge (Richard Jury Mysteries) [Martha Grimes, Steve West] on . *FREE* shipping on qualifying offers. Robbie Parsons is one of London's finest, a black cab driver who knows the city by heart.

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Opal - Wikipedia

Opal is a hydrated amorphous form of silica (SiO 2 ·nH 2 O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals.

Foreign Direct Investment Impact On Tanzania Mining Sector

FDI is made to acquire a lasting interest in a foreign enterprise with the purpose of having an effective voice in its management. It is a business investment...

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TRANS LIMPOPO USED TRACTORS | Tzaneen

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10 Really Expensive Gemstones: From Taaffeite To Blue Diamond ...

What is the most expensive gemstone in the world? In 2018 it's a blue diamond costing nearly $4 million per carat, besting the previous holder, a Pink Star diamond a ...

Tanzanite Color Grading – So Many Systems, Which to Trust?

The Tanzanite Foundation Grading System. The Tanzanite Foundation has developed its own color grading system which is used mostly in its native South Africa. It has attempted to group Tanzanite colors into a simple, consumer friendly chart shown below.