The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.
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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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All jewellery professionals are familiar with the city of Shenzhen, a global jewellery manufacturing centre and a leader of China’s fast-growing gem and jewellery industry. Join the GIA team as we tour the city and discover more about its leading jewellery brands.
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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.
Read MoreGemmological and chemical analysis of bright green gem-quality opal from Tanzania.
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Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
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This article, from the Winter 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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