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- Lecture • Enhanced Emeralds/Madagascar Sapphire • Santa Fe • 29 August 2005
- Lecture • Enhanced Emeralds/Madagascar Sapphire • Honolulu • 10 November 2005
- Lecture • Enhanced Emeralds/Madagascar Sapphire • San Francisco • 10 January 2006
- Lecture • Madagascar Sapphire • Orlando • 29 April 2006
- Lecture • From Madagascar to Malysheva • Toronto • 28 October 2006
- Lecture • Gem Hunting in Central Asia • Bangkok • 7 December 2006
- Lecture • From Madagascar to Tajikistan • Tucson • 1 February 2007
- Lecture • Jade – Stone of Heaven • Pasadena, CA • 31 March 2007
- Lecture • People & Places • Washington, DC • 9 April 2007
- Lecture • Jade: Stone of Heaven • Carlsbad, CA • 21 April 2007
- Lecture • People & Places • Santa Ana, CA • 23 June 2007
- Lecture • People & Places • Tucson • 8 February 2008
- Lecture • People & Places • Bangkok • 9 July 2008
- Lecture • Hunting gems in Southern Tanzania • Bangkok • 9 March 2009
- Lecture • Jade – Stone of Heaven • Bangkok • 29 April 2009
- Lecture • Humanistic Gemology • Tucson • 3 February 2010
- Lecture • Gemological Heresies • Bangkok • 29 June 2011
- Lecture • Heaven Below • Jaipur, India • 2 November 2011
- Lecture • Andesine: A Panel Discussion • Tucson • 1 February 2012
- Lecture • People & Places • Seoul, S. Korea • 20 April 2012
- Lecture • Jade – Stone of Heaven • London • 4 November 2012
- Lecture • Padparadscha Sapphire • Bangkok • 12 December 2012
- Lecture • Mogok: Valley of Rubies • Carlsbad, CA • 6 April 2013
- Lecture • Padparadscha Sapphire • Bangkok • 29 May 2013
- Lecture • Ruby & Sapphire: A Collector's Guide • Tucson, AZ • 6 February 2014
- Lecture • Ruby & Sapphire: A Collector's Guide • Bangkok • 26 February 2014
- Lecture • Ruby & Sapphire: A Collector's Guide • Adelaide • 26 July 2014
- Lecture • Gemological Heresies • Adelaide • 27 July 2014
- Lecture • Gemological Heresies Part 2 • Bangkok • 24 September 2014
- Lectures • Ruby & Sapphire: A Collector's Guide • Hong Kong • 18 September 2014
- Lecture • Ruby Inclusions • Hong Kong • 18 September 2014
- Lecture • Mogok Ruby • Hong Kong • 20 September 2014
- Lecture • Gemological Heresies • London • 2 November 2014
- Lecture • Ten Thoughts on Gemology • Chiang Mai • 9 December 2014
- Lecture • Gemological Heresies • Arusha, Tanzania • 22 April 2015
- Lecture • Ruby & Sapphire: A Collector's Guide • Arusha, Tanzania • 22 April 2015
- Lecture • Padparadscha Sapphire • Colombo • 17 May 2015
- Lecture • Mogok Ruby • Paris • 8 June 2015
- Lecture • Ruby & Sapphire: A Collector's Guide • Taipei • 14 August 2015
- Lecture • Gemological Heresies • Taipei • 16 August 2015
- Lecture • Ruby & Sapphire: A Collector's Guide • Hualien, Taiwan • 4 December 2015
- Lecture • Ten Thoughts on Gemology • Tucson • 3 February 2016
- Lecture • Ruby & Sapphire: A Collector's Guide • Shanghai • 28 May 2016
- Lecture • Ruby & Sapphire: A Collector's Guide • Hong Kong • 17 September 2016
- Lecture • Ruby & Sapphire: A Collector's Guide • Shanghai • 15 December 2016
- Lecture • Sapphire Around the World • Carlsbad, CA • 8 April 2017
- Lecture • Madagascar: Sapphire Isle • Paris • 12 June 2017
- Lecture • Ruby Inclusions • Sweden • 17 June 2017
- Lecture • Ruby & Sapphire: The Secret World • Dallas • 26 August 2017
- Lecture • Seeing Red: Ruby • Bangkok • 4 November 2017
- Lecture • Gemological Heresies • Colombo • 17 December 2017
- Lecture • Ruby Inclusions • Yangon, Myanmar • 11 January 2018
- Lecture • Madagascar: Sapphire Isle • Tucson • 31 January 2018
- Lecture • Seeing Red: Ruby • Baltimore • 12 August 2018
- Lecture • Gemological Heresies • Washington, DC • 14 August 2018
- Lecture • Jade: China's Gift to the World • Bangkok • 10 September 2018
- Lecture • Gem Color Types • Chicago • 13 September 2018
- Lecture • Seeing Red: Ruby • Hong Kong • 15 September 2018
- Lecture • Jade: China's Gift to the World • Shanghai • 1 December 2018
- Lecture • Ruby & Sapphire: A Collector's Guide • Changchun, China • 15 December 2018
- Lecture • Gem Color Types • Tucson • 4 February 2019
- Lecture • Journey to the Center of the Gem • Tucson • 6 February 2019
- Lecture • Jade: China's Gift to the World • San Francisco • 25 March 2019
- Lecture • Journey to the Center of the Gem • Bangkok • 27 March 2019
- Lecture • Ruby & Sapphire: A Collector's Guide • Houston • 27 March 2019
- Lecture • Jade: China's Gift to the World • Houston • 28 March 2019
- Lecture • Jade: China's Gift to the World • Shanghai, China • 18 April 2019
- Lecture • Jade: China's Gift to the World • Suzhou, China • 19 April 2019
- Lecture • Jade: China's Gift to the World • Switzerland • 29 April 2019
- Lecture • Ruby: Seeing Red • Switzerland • 30 April 2019
- Lecture • Madagascar: Sapphire Isle • Luzern, Switzerland • 1 May 2019
- Lecture • Ruby & Sapphire: A Collector's Guide • Wuhan, China • 25 May 2019
- Lecture • Jade: China's Gift to the World • Taipei, China • 16 June 2019
- Madagascar: Sapphire Isle • Lecture • Tucson, AZ • 6 February 2020
- Jade: China's Gift to the World • Lecture • Tucson, AZ • 5 February 2020
- Inside Out: Journey into the Center of a Gem • Lecture • Paris, France • 12 March 2020
- Microscopy & Photomicrography • Lecture • Birmingham, UK • 16 March 2020
- Discover the Gemstones: Ruby & Sapphire Exhibition • Exhibition • Hong Kong
- Lecture • Jade: China's Gift to the World • Houston • 16 July 2022
- Lecture • Jade: China's Gift to the World • Copenhagen • 1–2 October 2022
- Lecture • Jade: China's Gift to the World • London • 6 November 2022
- Lecture • Jade: A Workshop • Tucson • 1 February 2023
- Lecture • A Canary in the Ruby Mine • Tucson • 29 January 2023
- Lecture • Jade: China's Gift to the World • Tucson • 29 January 2023
- Lecture • Greasy Business • Oiled Gems Fraud • Taipei • 18 March 2023
- Lecture • The Mystery of Inclusions: A Panel Discussion • Tucson • 4 February 2023
- Lecture • Earth's Time Capsule: Inclusions in Colored Gemstones and Diamonds • Bangkok • 20 February 2023
- Lecture • Inside Out • Journey into the Center of a Gem • Tokyo • 2 March 2023
- Lecture • A Canary in the Ruby Mine • Bangkok • 9 September 2023
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