Pink-to-red coral has a long history as an ornamental gem material in jewelry, carvings, and sculptures. However, due to a variety of environmental and legal factors, the supply of high-quality, ...

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 ...

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Natural-color saltwater cultured pearls from Pinctada margaritifera were studied by diffuse reflectance UV-Vis-NIR spectroscopy to identify the absorption features associated with their various colors ...

Africa was the major source of diamonds for most of the 20th century, but Australia and Sakha (of the Russian Federation) now produce about half the world’s supply. Also, most of the production today ...

The Thai city of Chanthaburi is a well-known international trading hub for colored gemstones but was once an important corundum mining center. In recent decades, mining activity in the area has ...

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 ...

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, ...

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 ...

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 ...