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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. 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 ...

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.

  5. 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 ...

  6. 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 ...

  7. James Avery Artisan Jewelry - Wikipedia

    en.wikipedia.org/wiki/James_Avery_Artisan_Jewelry

    James Avery Artisan Jewelry is a Texas-based, family-owned company that specializes in designing hand-crafted rings, bracelets, necklaces, charms, earrings, and other jewelry. Its founder, James Avery, first started crafting jewelry in Kerrville, Texas in 1954 out of his (then) mother-in-law's garage. Over time, the company expanded and became ...

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