One of the greatest concerns with emerald filling is the degree of clarity enhancement such treatment represents. Stones that appear to have excellent clarity with the unaided eye are often revealed ...

An aquamarine crystal in its natural state shows why these specimens are prized for their beauty. - Courtesy Daniel Trinchillo, Fine Minerals International Aquamarine is the green-blue to blue variety ...

Gemstone enhancements and their disclosure became the most important gemological issue for the jewelry trade in the 1990s. Growing public awareness of treatments and the greater use of sophisticated ...

Moonstone’s mysterious, billowy, glow has fascinated people for centuries. According to Hindu mythology, moonstone is made of solidified moonbeams. Many other cultures also associate this gem with ...

This amethyst crystal is from Namibia. It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top. Courtesy Daniel Trinchillo, Fine Minerals ...

This is the second part in a three-part series on the origin of color in gem materials. This article discusses colors produced by (1) processes that involve multiple atoms (e.g., blue sapphire, ...

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 ...

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 ...

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 ...

During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges. This transformation was caused by the ...

If you were born in the month of June, you are lucky enough to have three birthstones to call your own. June is one of only three months (the others are August and December) that has three birthstones ...

The cover of the newly published book, William Ruser: The Jeweler Who Charmed Hollywood, written GIA Research Librarian Judy Colbert and Co-Author Peggy Tsiamis. First book about the jeweler to the ...