Many consumers and gem enthusiasts are most familiar with yellow and golden amber commonly found in the Baltic Sea region and the Dominican Republic. However, the gem can also be white, orange to red, ...
The 75.47-carat Hooker Emerald was worn by Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire. Photo by Chip Clark, courtesy Smithsonian Institution, National Museum of Natural ...
Figure 1. A limited amount of emeralds have so far been produced from the Fazenda Bonfim region in Brazil’s Rio Grande do Norte State. The faceted stones shown here weigh 1.29–1.92 ct, and the ...
Mineralogy and Geochemistry of Turquoise from Tianhu East, Xinjiang, China Examines turquoise from northern China and identifies a geographic origin indicator to distinguish it from other Chinese ...
GIA On Campus and accelerated programs and lab classes are available in Shenzhen through a cooperative program at Peking University Resource College. Programs and classes are taught by GIA instructors ...
Figure 1. The untouched opal specimen displays the yellow coating caused by years of storage in silicone oil. Photo by Ted Grussing. In the 1980s, the author and his wife, Corky, acquired large ...
GIA programs and courses are offered year-round on a rolling basis at GIA campuses around the globe. This enables students to jumpstart their gem and jewelry career studies at the soonest, most ...
This course examines jewelry’s important features and how they combine to give a piece its unique value. Content includes the unique qualities of precious metals, how to describe them to customers, ...
Madagascar is one of the great wonders of our planet. Wim Vertriest, Manager of Field Gemology at GIA, takes us on a journey back in time to understand how the island acquired its incredible gemstone ...
Jadeite jade is one of the most important aggregate gems in today’s global marketplace, with known sources in Myanmar, Japan, Russia, and Guatemala. Among them, Myanmar is the most legendary and still ...
CARLSBAD, Calif. – April 25, 2024 – Two leading gem and jewelry industry events will come together in September 2025, offering insight into cutting-edge gemological research, education, training and ...
2024年7月15日（月） 大統領記念日 - 1日目 2024年7月16日（火） 大統領記念日 - 2日目 2024年9月30日（月） 独立記念日（ボツワナデー） 2024年10月1日（火） 独立記念日（振替休日） 2024年12月23日 ...
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