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The key event of the Gem, Mineral & Fossil Showcase is the Tucson Gem & Mineral Show produced by the Tucson Gem and Mineral Society. This show has been held annually since 1955 and now occupies 181,000 square feet (16,800 m 2) of the Tucson Convention Center. Many museums and universities, including the Smithsonian Institution and the Sorbonne ...
In Australia, there are numerous gem shows, including an annual gem show called the GEMBOREE, which is a nationwide lapidary competition. There is a collection of gem and mineral shows held in Tucson, Arizona, at the beginning of February each year. The event began with the Tucson Gem and Mineral Society Show and has now grown to include dozens ...
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The Patricia is one of the few large gem-quality emeralds that remains uncut. [11] Also on display was the 563 carat (113 g) Star of India , the largest, and most famous, star sapphire in the world. It was discovered over 300 years ago in Sri Lanka , [ citation needed ] most likely in the sands of ancient river beds from where sapphires ...
Through its library and subject experts, GIA acts as a resource of gem and jewelry information for the trade, the public and media outlets. [ 2 ] In 1953 the GIA developed its International Diamond Grading System and the "four Cs" ( cut , clarity , color , and carat weight) as a standard to compare and evaluate the quality of diamonds.
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