GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.
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Writers have compared opals to volcanoes, galaxies and fireworks. Admirers gave extraordinary opals poetic names like Pandora, Light of the World and Empress.
Read MoreThese red, pink and orange hued gems evoke passion and excitement – and are sure-fire accessories for sultry summer days.
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Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah and Quilpie.
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Lightning Ridge is the world capital of fine black opals, the most desired of all opals. In June 2015 a group of GIA field gemmologists visited this legendary town in New South Wales, Australia. Come with us to explore this important source of fine opals.
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Boulder opal is becoming more and more popular. Australia’s central Queensland is home to more than a dozen of sources of this stone. Come with GIA field gemmologists to find out more about this unique gem.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreThe distinctive orange-to-red “fire" opals from Querétaro have not been found in significant quantities at any other locality.
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Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
Read MoreOpal occurs as nodules in volcanic rocks at a new gem opal locality in the Menz Gishe district of Shewa Province, Ethiopia.
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