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1999, Oct.2 -Speaker, International Gemmo. Conference (Goa, India) |
 2001, March 15- Speaker, CIBSO Congress (Paris, France) |
 2001, May 31-Speaker, GIA Alumni Assoc. (Bangkok, Thailand) |
 2001, Nov.15- Speaker, Hong Kong Gemmo. Assoc. (Hong Kong)
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 2002, March 25-Speaker, CIBJO Congress (Munich, Germany)
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 2002, May 6- Speaker, Scottish Gemmo. Assoc. (Perth, UK)
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 2002, June 21-Speaker, Austrian Gemmo. Assoc. (Lintz, Austria) |
 2002, Aug.26-Speaker, Thai Gem-Jewelry Assoc. (Bangkok, Thailand) |
 2002, Sept.14-Speaker, NZ Gemmo. Assoc. (Auckland, New Zealand) |
 2002, Sept. 16-Speaker, Australian Gemmo. Assoc. (Sydney, Australia)
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 2002, Sept.19-Speaker, GLIC (Bangkok, Thailand)
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 2002, Oct.9 -Speaker, Vigego Co. Gov.VN Authority (Hanoi, Vietnam)
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 2002, Dec.14-Speaker, GIA Alumni Assoc. (New York) |
 2003, Feb.5-Speaker, Accred. Gemmo. Assoc. (Tucson, USA) |
 2003, May 30-Speaker, Greek Gemmo. Assoc. (Athens, Greece) |
 2003, Oct.26-Speaker-Chinese gemmologists (Bangkok, Thailand)
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 2004, Febr.27-Speaker-CIBJO Congress (Bangkok,Thailand)
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2004, Sept.18 -Speaker, Int. Gemm. Conference (Wuhan, China) |
 2005, Feb.3- Speaker, Accred. Gemmo.Assoc. (Tucson,USA)
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 2005, Feb.5- Speaker, Gemlab Gemmo. Lab (Tucson,USA)
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 2005, Feb.17-Speaker, American gemmologists (Bangkok, Thailand) |
 2005, May 29-Speaker, Istituto.Gemmo.Italiano (Milan, Italy)
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.jpg) 2006 Oct.7-Speaker, Indian Promotion Council (Jaipur, India)
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 2006 Oct.10-Speaker, Gemmo. Institute of India (Bombay, India)
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 2007, July 15-Speaker, International Gem. Conference (Moscow, Russia)
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 2008, Sep.24-Speaker, GIA Alumni Assoc. (Bangkok, Thailand) |
 2008, Nov.25-Speaker, French gemologists (Bangkok, Thailand) |
 2010, Aug.11-Speaker, Australian Gemm.Assoc. (Perth, Australia) |
 2010, Aug.17-Speaker, Australian Gemm.Assoc. (Sydney, Australia)
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 2010, Aug.23-Speaker, Australian Gemm.Assoc. (Melbourne, Australia) |
 2010, Aug.28-Speaker, Australian Gemm.Assoc. (Adelaide, Australia)
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 2010, Nov.4-Speaker, Gemmological Assoc. of Great Britain (Bath, UK)
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 2010, Nov.6-Speaker, Gemmo. Assoc. of Great Britain (London, UK)
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 2010, Nov.10-Speaker, Scotish Gemmo. Assoc. (Ediburgh, Scotland)
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 2010, Nov.15-Speaker, Greek Gemmo. Assoc. (Athens, Greece)
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 2010, Dec.5-Speaker, Gemm. Assoc. of Hong Kong (Hong Kong) |
 2011, Feb.3-Speaker, Gem Industry Lab Committee (Tuscon, USA) |
 2011, Apr.9-Speaker, Gemmo. Assoc. of Korea (Seoul, S.Korea) |
 2011, May 15-Speaker, Istituto Gemmologico Italiano (Rome, Italy) |
 2014, Feb.27-CIBJO Congress (Bangkok, Thailand)
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 2015, July 15-Speaker, Swedish gemologists (Lavanaara, Sweden) |
 2015, Apr.15-Speaker, Finnish Gemmo. Assoc. (Helsinki, Finland) |
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2003, Oct.26-Speaker-Chinese gemmologists (Bangkok, Thailand).jpg)
2005, Feb.17-Speaker, American gemmologists (Bangkok, Thailand).jpg){kind=link}