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2. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   Present, dichroism or trichroism, depending on heat treatment. Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate ), caused by small amounts of vanadium. [ 3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a ...

3. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...

4. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   This is a list of gemstones, organized by species and types. Minerals There ... Tanzanite (var.) Thulite (var.) Zultanite; Zunyite; Artificial and lab created.

5. Gemstones in the Bible - Wikipedia

   en.wikipedia.org/wiki/Gemstones_in_the_Bible

   The Hebrews obtained gemstones from the Middle East, India, and Egypt. [ 1] At the time of the Exodus, the Bible states that the Israelites took gemstones with them ( Book of Exodus, iii, 22; xii, 35–36). When they were settled in the Land of Israel, they obtained gemstones from the merchant caravans travelling from Babylonia or Persia to ...

6. Gems of Sri Lanka - Wikipedia

   en.wikipedia.org/wiki/Gems_of_Sri_Lanka

   Sri Lanka, geologically speaking is an extremely old country. Ninety percent of the rocks of the island are of Precambrian age, 560 million to 2,400 million years ago. The gems form in sedimentary residual gem deposits, eluvial deposits, metamorphic deposits, skarn and calcium-rich rocks. Nearly all the gem formations in Sri Lanka are located ...

7. TanzaniteOne - Wikipedia

   en.wikipedia.org/wiki/TanzaniteOne

   TanzaniteOne. TanzaniteOne (TanzaniteOne Mining Ltd) is a gemstone mining company which exclusively mines the blue gemstone, tanzanite. TanzaniteOne Mining Ltd is located in Block C, Merelani, Tanzania. Merelani is the world's only known source of tanzanite. TanzaniteOne Mining Ltd was founded by Richland Resources, a gemstone development and ...