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CARLSBAD, Calif. – April 25, 2019 – To better understand how the most ancient continents came to be, researchers examined tiny mineral remnants trapped in diamonds during the formation of the earth.
Read MoreWinter 2013 issue reviews latest gemological research
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Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Read MoreTo update the contact information on your GIA account please login to your client portal. You can manage your account details, team members, addresses, email notifications and much more.
Read MoreLearn about the requirements to set up a new account in our laboratories.
Read MoreMost important works in GIA’s Cartier Rare Book Repository and Archives digitized
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Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.
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Article
Some 40,000 buyers attended the June 2013 Hong Kong Jewellery & Gem Fair, one of the largest gem shows in the world.
Read MoreGIA will introduce the revised format for its diamond grading and gem identification reports beginning January 1, 2014.
Read MoreElyse Zorn Karlin and Gail Brett Levine will share useful information they’ve learned from their combined 80-plus years of studying antique and period jewelry.
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