Lecture Schedule
Because of our expertise, members of the AGTA GTC’s staff are often called on to give lectures. We have lectured across the US, as well as Canada, Australia, Thailand, Hong Kong, Europe, and elsewhere. Below is our current schedule (click here for a list of previous lectures):

Australia, May 13–24, 2006Australian Gemmological Association logo
AGTA GTC Chief Gemologist John Koivula will be giving a series of eight lectures throughout eastern Australia over a period from May 13–24, 2006. In Sydney, John will be the keynote speaker at the Gemmological Association of Australia's 2006 National Conference from May 19–21.

  • Saturday, May 13th – Melbourne GAA HQ – 6:30 to 8:30 PM
    Microworld of diamond and amber
  • Monday, May 15th – Brisbane – 7:30 to 9:00 PM
    Microworld of diamond and amber
  • Saturday, May 20th – Sydney Harbour Marriott Hotel – 1:30 to 3:30 PM
    Microworld of gemstones and opal
  • Wed., May 24th – Lightning Ridge – 8:30 to 9:30 PM
    Microworld of opal

Las Vegas JCK Show, June 1–2, 2006

Colombian Gem News
Moderator: Stuart Robertson (Gemworld International)
Panelists: Loretta Castoro; Dr. Lore Kiefert (AGTA GTC); Ron Ringsrud (Ronald Ringsrud Co.); Robert Weldon (GIA)
Thursday, June 1, 2006
10:30–11:30 AM

Recently, this group of panelists closely witnessed mining and treatments of Colombian gemstones. What they discovered was a new generation of Colombian mine owners who have formed strategic alliances aimed at benefiting the region as a whole. Through cooperation, this group hopes to add value and restore confidence in the Colombian emerald market by implementing Fair Trade principles and product certification with meaningful disclosure. The Colombian market is actively pursuing international buyers by establishing an emerald center near the airport in addition to the major trading center in Bogota's business district. Hear from a reporter, a value-added specialist who is a former colored gemstone buyer for Tiffany, the head of the AGTA GTC, and a dealer specializing in Colombian gemstones in this session.

Dr. Lore Kiefert, (AGTA GTC)
Friday, June 2, 2006
10:30 –11:30 AM

The AGTA Gemological Testing Center encounters unusual gemstones in the midst of more routine submissions. Sometimes these unusual gemstones are set to drain consumer confidence and, consequently, the dealer or retailer's profitability. Learn what AGTA is watching for in the Center now and how GTC works on identification, treatments, and country of origin.

Toronto, Canada, October 28, 2006Canadian Gemmological Association logo
The AGTA GTC's Richard Hughes will be delivering the keynote address at the Canadian Gemmological Association's 2006 Conference and Graduation.

  • Topic to be announced
    Richard Hughes (AGTA GTC)
    28 October, 2006
    Toronto, Canada

Waxing poetic
AGTA GTC’s Lab Director, Dr. Lore Kiefert, dissecting the conflicting interests of gemstone origin reports at GemmoBasel 2005.


American Gem Trade Assocation Gemological Testing Center
18 East 48th St., Suite 502
New York, NY 10017, USA
Tel: 212-752-1717; Fax: 212-750-0930
E-Mail: info@agta-gtc.org; Web: www.agta-gtc.org
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