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  2. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    TanzaniteOne, a major commercial player in the tanzanite market, through its non-profit subsidiary, the Tanzanite Foundation, [27] has introduced its own color-grading system. [28] The new system's colour-grading scales divide tanzanite colors into a range of hues, between bluish-violet, indigo and violetish-blue.

  3. Color chart - Wikipedia

    en.wikipedia.org/wiki/Color_chart

    Color chips or color samples from a plastic pellet manufacturer that enables customers to evaluate the color range as molded objects to see final effects. A color chart or color reference card is a flat, physical object that has many different color samples present. They can be available as a single-page chart, or in the form of swatchbooks or ...

  4. Zoisite - Wikipedia

    en.wikipedia.org/wiki/Zoisite

    Zoisite may be blue to violet, green, brown, pink, yellow, gray, or colorless. Blue crystals are known under the name tanzanite. It has a vitreous luster and a conchoidal to uneven fracture. When euhedral, zoisite crystals are striated parallel to the principal axis (c-axis). Also parallel to the principal axis is one direction of perfect cleavage.

  5. 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]

  6. List of colors (alphabetical) - Wikipedia

    en.wikipedia.org/wiki/List_of_colors_(alphabetical)

    This is an accepted version of this page This is the latest accepted revision, reviewed on 14 December 2024. For other color lists, see Lists of colors. This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "List of colors" alphabetical ...

  7. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Aquamarine is often heated to remove yellow tones, or to change green colors into the more desirable blue, or enhance its existing blue color to a deeper blue. [42] Nearly all tanzanite is heated at low temperatures to remove brown undertones and give a more desirable blue / purple color. [44]

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