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  2. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    In its rough state tanzanite is coloured 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] The gemstone was given the name "tanzanite" by Tiffany & Co. after Tanzania, the country in which it was discovered. The scientific name of "blue-violet zoisite" was not ...

  3. Birthstone - Wikipedia

    en.wikipedia.org/wiki/Birthstone

    They also replaced December's lapis with zircon and switched the primary/alternative gems for March. The American Gem Trade Association added tanzanite as a December birthstone in 2002. [ 5 ] In 2016, the American Gem Trade Association and Jewelers of America added spinel as an additional birthstone for August. [ 6 ]

  4. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide

  5. Zircon - Wikipedia

    en.wikipedia.org/wiki/Zircon

    A pale blue zircon gemstone weighing 3.36 carats This bracelet has zircon gemstones. The metal is zinc alloy base with silver coating. The metal is zinc alloy base with silver coating. Transparent zircon is a well-known form of semi-precious gemstone , favored for its high specific gravity (between 4.2 and 4.86) and adamantine luster .

  6. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

  7. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]

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