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  2. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7] Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or purple. [8] Topaz is a nesosilicate mineral, and more specifically, an aluminosilicate mineral. [9]

  3. American Golden Topaz - Wikipedia

    en.wikipedia.org/wiki/American_Golden_Topaz

    The American Golden Topaz, housed in the National Museum of Natural History, Washington D.C.. The American Golden Topaz, a 172-faceted topaz weighing 22,892.5 carats (4.57850 kg; 10.0939 lb), is the largest cut yellow topaz in the world, and one of the largest faceted gems of any type in the world. [1]

  4. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    American Golden Topaz, the largest cut yellow topaz, weighing nearly 23,000 carats (4.6 kg). Chalmers Topaz, a 5,899.5-carat (1.17990 kg) cut topaz. Tsavorite

  5. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...

  6. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    It is nearly impossible to differentiate between cut citrine and yellow topaz visually, but they differ in hardness. Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul. The name is derived from the Latin word citrina which means "yellow" and is also the origin of the word "citron". [47]

  7. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Virtually all blue topaz, both the lighter and the darker blue shades such as "London" blue, has been irradiated to change the color from white to blue. Most green quartz (Oro Verde) are also irradiated to achieve the yellow-green color. Diamonds are mainly irradiated to become blue-green or green, although other colors are possible.

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