The most colorful gemstones on Earth - Jeff Dekofsky
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Opals are truly one of the world’s most fascinating and beautiful gemstones. A tremendous resource for all things opal is the American Opal Society website. Here you can read articles, find out-of-print books, learn about cutting and polishing opals at home and find links to member sites as well. The Gemological Institute of America (GIA) is also a storehouse of information regarding opal formation, types and some beautiful photographs of gem grade opals. Other good resources for opal information such as colors, patterns, metaphysical properties, value ranges, varieties of different types of opals, etc. are the GemSelect and Gemdat opal pages.
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