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- Lecture Venues/Groups Addressed by Lotus Gemology's Expert Gemologists
- Padparadscha Sapphire & the Ownership of Words
- Fiber-Optic Light in Gemology • Living in the Dark Ages
- Ruby, Sapphire & Spinel Auction Records • Under the Hammer • Lotus Gemology
- Jade Buying Guide • Jade Auction Records
- Mozambique Ruby • Red Rain Pours into the Market
- Ruby & Sapphire Color Types • From Peacock to Pigeon's Blood
- GemmoRaman-532 • Instrument Review • Lotus Gemology
- 从孔雀蓝到鸽血红 细数宝石之美 • 红蓝宝石之动人色泽
- Gem Inclusion Pairs • Hyperion Siamese Twins
- จากพีค็อกบลูถึงสีเลือดนก • นิยามแห่งสีจากโลตัสเจมโมโลจี
- Padparadscha or Pretender • An Unusual Pink-Orange Sapphire
- Colored Stone Grading • A Heretic's Guide
- Pressure Heated Sapphire • Squeezing Sapphire • Corundums treated with high temperatures and low pressure (HT+P)
- Spinel Inclusions • An Exercise in Aesthetics
- Gem Testing Labs • Tips on Choosing a Colored Gem Testing Lab • Lotus Gemology
- Madagascar Ruby & Sapphire • Ruby & Sapphire: A Gemologist's Guide
- Madagascar Sapphire: Low-Temperature Heat Treatment Experiments
- World Sapphire Market Update • 2020 • Lotus Gemology
- FTIR in Gem Testing • A Pink Sapphire Lesson
- Contemporary Jade Carving in China • Interview with Lin Tze-Chuan
- Long-Wave Ultraviolet Torches • A Gemologist’s New Best Friend
- Black Star Sapphire Surprise
- Ruby & Sapphire Books • Collecting the Literature of Ruby & Sapphire (Corundum) • Hidden Treasure
- Oiled Spinel & Tanzanite • Shocking Revelations
- Treatment Disclosure • Notes from the Eastern Front
- Made You Look • The Challenges of Identifying Inclusions at First Sight
- Bubbling Up • Carbon Dioxide in Sapphire
- An A-maze-ing Fingerprint in Spinel
- Vietnamese Skyline
- Apatite Oiling • Before and After
- A Canary in the Ruby Mine • Low-Temperature Heat Treatment Experiments on Burmese Ruby
- Apatite in Blue Sapphire
- Blue Apatite in Tanzanian Garnet
- Yellow Sapphires with Unstable Color
- Curved Banding in Flame-Fusion Synthetic Sapphires
- Describing Color in Gems • A Fool's Guide • Lotus Gemology
- Meet the Extraordinary 40 • Richard Hughes Honored by Jewellery News Asia
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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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- Burmese Sapphire Giants • Lotus Gemology
- Burma's Jade Mines • An Annotated Occidental History
- Identifying Yellow Sapphire • Blue Filter • Proletarian Gemology
- Ruby and Spinel in Tajikistan • Moon Over the Pamirs • Lotus Gemology
- Rutile in Corundum • Following the Silk Road • Lotus Gemology
- Cobalt-Doped Glass-Filled Sapphires • An Update • Lotus Gemology
- Gem Inclusions & the Symmetry of Crystals • Inside Out • Lotus Gemology
- Guangzhou Jade Market Puzzle • A Chinese Jade Box
- Gemology in the 21st Century • Betwixt Two Worlds • Lotus Gemology
- Tanzanite Mines of Merelani • Working the Blueseam • Lotus Gemology
- Downtown • Gem Hunting in Tanzania • Lotus Gemology
- Ruby Connoisseurship • Seeing Red
- Sapphire Connoisseurship • Judging Sapphire • Passion Fruit
- Gem Treatment Disclosure • Trust • Lotus Gemology
- Fracture Healing of Ruby • Fluxed Up
- In Search of the Lost Andesine Mines • Part I • Hunting Barack Osama in Tibet • Lotus Gemology
- In Search of the Lost Andesine Mines • Part II • Faith • Lotus Gemology
- Spinel • Resurrection of a Classic • Lotus Gemology
- Heat Seeker • UV Fluorescence as a Gemological Tool • Lotus Gemology
- Last Thai Ruby Miner • Red Sky at Dusk
- Mogok Revisited • A Brief Stay in Heaven • Lotus Gemology
- Mogok Geology Primer • Rock Talk • Lotus Gemology
- Sorcerers & Sapphires • A Visit to Madagascar • Lotus Gemology
- Buying at the Source • Dick's Law and Other Sundry Maxims of the East • Lotus Gemology
- Burmese Jade • The Inscrutable Gem
- Emerald Buddha • Symbol of the Kingdom of Thailand
- Verneuil Synthetic Corundum ID • Dangerous Curves • Lotus Gemology
- Brilliance, Windows, and Extinction in Gemstones • Lotus Gemology
- Black Prince's Ruby • Blood-Red Souvenir of Conquest • Spinel
- History of Chanthaburi & Pailin • Moontown • Lotus Gemology
- Gem Testing with the Spectroscope • Lotus Gemology
- Pigeon's Blood • Pilgrimage to Mogok – Valley of Rubies
- Burma’s Jade Mines • Tracing the Green Line • Lotus Gemology
- Russian Jade Deposits • From Russia with Jade
- Jade in Upper Burma • Heaven and Hell • Lotus Gemology
- Beryllium Diffusion in Orange Sapphire • The Skin Game
- Lenny Cram's Opal Mine • Fun Down Under • Lotus Gemology
- Hunting the Mother Lode Abroad • Gemological Travel • Lotus Gemology
- FTIR in Gem Testing • FTIR Intrigue • Lotus Gemology
- Ruby, Pink Sapphire & Padparadscha • Walking the Line
- Pleochroism in Faceted Gems • An Introduction • Lotus Gemology
- Emerald & Alexandrite from Russia • A Closer Look • Lotus Gemology
- Testing Yellow Sapphire • Passport to Obscurity
- Seeing Red • Genetics & Color Vision • Lotus Gemology
- Presidium Synthetic Ruby Identifier • Instrument Review
- Rutile Silk in Sapphire • Discovery in 1878
- Oiled Gems Lab Alert • Lotus Gemology
- Dana Schorr • In Memoriam
- Lotus Gemology Report Lookup Guide
- Ruby From Madagascar • Let It Bleed • Lotus Gemology
- Inclusions in Gemstones • Hyperion Literature Sources
- Spinel Inclusions • Beyond Octahedra
- A Sapphire's Secret • Synthetic Yellow Sapphire
- Crystal Optics with the Refractometer • Lotus Gemology
- Oiled Ruby: A Remarkable Visual • Ruby Inclusions
- Sapphire With Growth Tube Cluster • Sapphire Inclusions
- Mogok Ruby With Remarkable Twinned Calcite Inclusion
- Six-Rayed Star in Sapphire from Myanmar
- Laos Sapphires • Laos – Land of a Million Elephants... & Sapphires
- Jade Books • Collecting the Literature of Jade • Hidden Treasure
- Ruby & Sapphire (Corundum) Inclusions • The Lotus Gemology Crystal Registry
- Gems & Gemology Lectures • Lotus Gemology Bangkok
- Jade • A Lifetime In Search of Heaven
- Advanced Gem Inclusion Search Engine • Hyperion Sherlock
- The Hardness of Fei Cui Jade • A Gemological Perspective
- Search Articles by Tag
- Lotus Images for Sale
- Books
- Corundum (1990) • Lotus Gemology
- Book of Ruby & Sapphire (2012) • Lotus Gemology
- Ruby & Sapphire (1992) • Lotus Gemology
- Ruby & Sapphire • A Gemologist's Guide (2017) • Lotus Gemology
- Ruby & Sapphire • A Collector's Guide (2014) • Lotus Gemology
- Terra Spinel • Terra Firma (2010) • Lotus Gemology
- Ruby & Sapphire (1997) • Lotus Gemology
- Ruby & Sapphire Colors • From Peacock to Pigeon's Blood
- Lotus Hat • Making Gemology Great Again • Order Page • Lotus Gemology
- Inside Out | GEM•ology Through Lotus-Colored Glasses (2020) | Book
- Jade • A Gemologist's Guide (2022) | Book
- Inclusion Database
- Reference Database
- Book Reviews
- Photoatlas of Inclusions in Gemstones, Volume 3 • Book Review • Lotus Gemology
- Photoatlas of Inclusions in Gemstones, Volume 2 • Book Review • Lotus Gemology
- A Geologist Speculates • Book Review • Lotus Gemology
- Imperial Jade of Burma & Mutton-Fat Jade of India • Book Review • Lotus Gemology
- The Eduard Josef Gübelin Story: The Art and Science of Gems • Book Review • Lotus Gemology
- Ruby • Book Review
- Ruby, Sapphire & Spinel: An Archaeological, Textual and Cultural Study • Book Review
- Diamond: An Early History of the King of Gems • Book Review
- Lotus Bibliography
- Articles