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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]
Amethyst (var.) Ametrine (var.) Aventurine ... Citrine (var.) Druzy (var.) Flint ... There are a number of artificial and lab grown minerals used to produce gemstones ...
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 ...
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.
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 ...
Signet Jewelers Ltd. (Ratner Group 1949–1993 then Signet Group plc to September 2008) is, as of 2015, the world's largest retailer of diamond jewellery. [1] The company is domiciled in Bermuda and headquartered in Akron, Ohio, and is listed on the New York Stock Exchange.
Shane Company or Shane Co. is the largest privately owned jeweler in the United States. [1] The company is a direct diamond, ruby, and sapphire importer that operates 20 retail stores across the US, as well as their website, ShaneCo.com.
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 ...