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  2. Citrine (quartz) - Wikipedia

    en.wikipedia.org/wiki/Citrine_(quartz)

    Quartz that derives its color from coatings or inclusions is not citrine. Heat-treated amethyst geode showing color zoning. Like amethyst, heat-treated amethyst often exhibits color zoning, or uneven color distribution throughout the crystal. In geodes and clusters, the color is usually deepest near the tips. [9]

  3. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Spanish emerald and gold pendant at Victoria and Albert Museum Enamelled gold, amethyst, and pearl pendant, about 1880, Pasquale Novissimo (1844–1914), V&A Museum number M.36-1928. Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early ...

  4. Ametrine - Wikipedia

    en.wikipedia.org/wiki/Ametrine

    Ametrine, also known as trystine, golden amethyst, or by the trade name bolivianite, is a variety of quartz with alternating zones of purple and yellow-orange coloration. Its name is a portmanteau of amethyst and citrine. While ametrine is commonly referred to as a combination of these two quartz varieties, some sources claim this is not ...

  5. Prasiolite - Wikipedia

    en.wikipedia.org/wiki/Prasiolite

    Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay area of ...

  6. Rio Grande (company) - Wikipedia

    en.wikipedia.org/wiki/Rio_Grande_(company)

    Rio Grande, a Berkshire Hathaway Company since 2013, offers jewelry-making supplies. While specializing in silver findings and fabrication materials, the company also provides metalsmithing tools and equipment, jewelry displays and packaging products, jewelry workbenches, casting machines and kilns, soldering and welding torches, gemstones ...

  7. Zale Corporation - Wikipedia

    en.wikipedia.org/wiki/Zale_Corporation

    As a marketing strategy, the Zale brothers instituted a credit plan whereby customers could pay "a penny down and a dollar a week", making jewelry and other merchandise affordable for the average working American. The success of this credit policy led to the company expanding to a total of 12 stores in Oklahoma and Texas by 1941.

  8. Citrine (colour) - Wikipedia

    en.wikipedia.org/wiki/Citrine_(colour)

    Citrine / ˈ s ɪ t r iː n / is a colour, the most common reference for which is certain coloured varieties of quartz which are a medium deep shade of golden yellow. Citrine has been summarized at various times as yellow, greenish-yellow, brownish yellow or orange. [2] The original reference point for the citrine colour was the citron fruit.

  9. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Clear quartz with natural iron inclusions or limonite staining may also resemble citrine, but it is not true citrine. [39] Like amethyst, heat-treated amethyst often exhibits color zoning, or uneven color distribution throughout the crystal. In geodes and clusters, the color is usually deepest near the tips. [46] This does not occur in natural ...

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