Tag Archives: John Koivula

Treatments and Synthetics: A Visual Review by John Koivula

Posted on September 30, 2016 by dcgiaorg

 John Koivula an Analytical Microscopist at the Gemological Institute of America shared a visual review of slides identifying common features for synthetic and treated rubies, sapphires, emeralds, diamonds, chrysoberyl, opal, spinel, quartz, jade, and corundum. The majority of characteristics seen … Continue reading →

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A Peek Behind the Curtain: The Edward Arthur Metzger Gem Collection – Elise Skalwold

Posted on July 24, 2015 by dcgiaorg

Elise Skalwold provided an informative and passionate talk to DCGIA in A Peek Behind the Curtain: The Edward Arthur Metzger Gem Collection. The collection was donated to Cornell University in 2004. Elise presented a visual feast of rare and unusual … Continue reading →

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