Author Archives: dcgiaorg

In Memory of Lisa Carp

DCGIA is sad to have lost a long time and cherished member; Lisa Carp.  Lisa died on Saturday, April 15.  Lisa taught and shared her mineral and gem knowledge with DCGIA members as well as countless students who attended her gemology … Continue reading

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Pearls, Questions and Answers by Teresa Tkacik, M.S.N., F.N.P.C.

Teresa provided a very informative history of pearls, how pearls are cultured, the characteristic of pearls, and Faux pearls, which included a hands on demonstration of how to evaluate pearls. Presentation copy Recommended reading: Tears of the Moon by Robert … Continue reading

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DCGIA 2017 Tucson Report

Thanks go out to all the speakers, members and guests who made this evening enjoyable and informative. Courtland Lee, DCGIA’s resident Geologist and Miner, was a vendor at the 2017 Tucson International Gem Show.  Courtland discussed the wonderful array of … Continue reading

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The Art of Gem Cutting by Thomas Trozzo

DCGIA Thanks Tom Trozzo for sharing a wealth of information and his award winning gemstones with our members and guests. Continue reading

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Gem, Lapidary and Mineral Society of Washington, DC. Auction

Sunday, October 30  http://www.glmsdc.org/ Preview & Artist’s Sale – Noon to 2 pm  –  LIVE Auction – 2 to 5 pm Auction Site:  Bethesda Woman’s Club, 5500 Sonoma Road,  Bethesda, MD 20817 Free parking at rear of building and on side streets.

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Treatments and Synthetics: A Visual Review by John Koivula

 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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The Magic of Alexandrite by Evan Caplan

Los Angeles gem dealer with a specialty for rare gemstones, Evan Caplan shared his passion for Alexandrite with the DCGIA Members. Alexandrite one of the birthstones for June, is a very rare color-change variety of the mineral chrysoberyl. Green in daylight and Red … Continue reading

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